Coding - Decoding
Coding is a system of signals. This is a method of transmitting information in the form of codes or signals without it being known by a third person.The person who transmits the code or signal, is called the sender and the person who receives it, is called the receiver. Transmitted codes or signals are decoded on the other side by the receiver—this is known as decoding.
Most competitive exams have a dedicated section of Coding –Decoding in Reasoning or Mental Ability. Many of students and readers find difficulty to solve questions based on Coding – Decoding in Mental Aptitude.
The Coding and Decoding Test is set up to judge the candidate’s ability.
Bank4Study has uploaded the coding and decoding shortcut methods, Tricks & Rules and Questions with Answers here. Candidates can check and go through it. Coding and decoding tips are very useful to those who are preparing for the attending the bank exam IBPS, SBI, LIC AAO, UPSC, IAS, CAT, XAT, MAT, SSC, GATE, and other competitive exams. We have also published the Solved examples for the coding and decoding aptitude.
Coding is a process of sending a message from master to slave that no other can understand that. Its ability of deciphering the rule and breaking the code. So here we need to find the exact code for the given code.
Most of the candidates will facing the problem to solve it. Also they lose their marks by not attending this question. If aspirants learnt how to the coding and decoding problem then its easy to solve and fast. For that we have clearly described the coding and decoding reasoning tricks. Also we have uploaded the coding decoding shortcuts for the aspirants to learn easily without any stress.
Coding is a process of sending a message from master to slave that no other can understand that. Its ability of deciphering the rule and breaking the code. So here we need to find the exact code for the given code.
Most of the candidates will facing the problem to solve it. Also they lose their marks by not attending this question. If aspirants learnt how to the coding and decoding problem then its easy to solve and fast. For that we have clearly described the coding and decoding reasoning tricks. Also we have uploaded the coding decoding shortcuts for the aspirants to learn easily without any stress.
How to Solve Coding Decoding Questions
a) Observe alphabets or numbers given in the code keenly.
b) Find the sequence it follows whether it is ascending or descending.
c) Detect the rule in which the alphabets/numbers/words follow.
d) Fill the appropriate letter/number/word in the blank given.
In questions on codes, a word (basic word) is coded in a particular way and the candidates are asked to code other words in the same way. The coding and decoding tests are set up to judge the candidate’s ability to decipher the rule that has been followed to code a particular word/message and break the code to decipher the message.
The Coding and Decoding is classified into Six types according to the on what way it is doing. They are
- Letter Coding
- Number Coding
- Mixed Coding
- Mixed Number Coding
- Decoding
- Symbols Coding
1. Letter Coding -
A particular letter stands for another letter in letter coding.Eg: If COURSE is coded as FRXUVH, how is RACE coded in that code?
(1) HFDU
(2) UCFH
(3) UDFH
(4) UDHF
(5) UDFG
In the given code, each letter is moved three steps forward than the corresponding letter in the word. So R is coded as U, A as D, C as F, E as H. Hence (3) is the answer.
Learn this table by heart. This is the only shortcut or trick to solve coding - decoding questions fast in Bank exams.
Learn this table by heart. This is the only shortcut or trick to solve coding - decoding questions fast in Bank exams.
Alphabets
|
Alphabetical Order
|
Reserve Order
|
A
|
1
|
26
|
B
|
2
|
25
|
C
|
3
|
24
|
D
|
4
|
23
|
E
|
5
|
22
|
F
|
6
|
21
|
G
|
7
|
20
|
H
|
8
|
19
|
I
|
9
|
18
|
J
|
10
|
17
|
K
|
11
|
16
|
L
|
12
|
15
|
M
|
13
|
14
|
N
|
14
|
13
|
O
|
15
|
12
|
P
|
16
|
11
|
Q
|
17
|
10
|
R
|
18
|
9
|
S
|
19
|
8
|
T
|
20
|
7
|
U
|
21
|
6
|
V
|
22
|
5
|
W
|
23
|
4
|
X
|
24
|
3
|
Y
|
25
|
2
|
Z
|
26
|
1
|
2. Number Coding -
In these questions, either numerical code values are assigned to a word or alphabetical code values are assigned to numbers. The candidate is required to analyse the code as per directions.
Case I: When numerical values are assigned to words.
Eg: If in a certain code ROPE is coded as 6821, CHAIR is coded as 73456 what will be the code for CRAPE?
(1) 73456
(2) 76421
(3) 77246
(4) 77123
(5) None of these
Clearly, in the given code, the alphabets are coded as follows.
R O P E C H A I
6 8 2 1 7 3 4 5
So CRAPE is coded as 76421, So the answer is (2)
Case II: When alphabetical code values are assigned to the numbers.
Eg: In a certain code 3456 is coded as ROPE & 15546 is coded as APPLE. Then how is 54613 coded?
(1) RPPEO
(2) ROPEA
(3) POEAR
(4) PAREO
(5) None of these
Clearly in the given figures, the numbers are coded as follows.
3 4 5 6 1 4
R O P E A L
So 54613 is coded as POEAR. The answer is (3)
3. Mixed Coding -
In this type of question, three or four complete messages are given in the coded language and the code for a particular word is asked.
In this type of question, three or four complete messages are given in the coded language and the code for a particular word is asked.
To analyse such codes, any two messages bearing the common word are picked up. The common code word will mean that word. Proceeding similarly by picking up all possible combinations of two messages the entire message can be analysed.
Eg: If tee see pee means drink fruit juice, see kee lee means juice is sweet, and lee ree mee means he is intelligent, which word in that language means sweet?
(1) see
(2) kee
(3) lee
(4) pee
(5) tee
In the first and the second statements the common word is juice and the common code word is see. So see means juice. In the second and the third statements, the common word is ‘is’ and the common code is lee. So lee means is. Thus in the second statement, the remaining word sweet is coded as kee. Hence the answer is (2).
4. Mixed Number Coding -
In this type of questions, three or four complete messages are given in the coded language and the code number for a particular word is asked.
Eg: If in a certain code language, 851 means good sweet fruit; 783 means good red rose and 341 means rose and fruit which of the following digits stands for sweet in that language?
(1) 8
(2) 5
(3) 1
(4) 3
(5) None of these
In the first and the second statements, the common code digit is 8 and the common word is good. So 8 stands for good. In the first and the third statements, the common code digit is 1 and the common word is fruit. So 1 stands for fruit. Therefore in the first statement, 5 stands for sweet. Hence the answer is (2).
5. Decoding -
In these questions, artificial or code values are assigned to a word or a group of words and the candidate is required to find out the original words.
Eg: If in a certain language FLOWER is written as EKNVDQ, what will be written as GNTRD?
(1) HEOUS
(2) HOUES
(3) HUOSE
(4) HOUSE
(5) None of these
Each letter of the word is one step ahead of the corresponding letter of the code.
E K N V D Q G N T R D
F L O W E R H O U S E
Thus HOUSE is written as GNTRD, So the answer is (4)
6. Symbols Coding -
This is a kind of coding recently included in the Reasoning section. In this type of questions either alphabetical code values are assigned to symbols or symbols are assigned to alphabets. The candidate is required to analyse the code as per direction.
Eg: 1. In a certain code ‘TOME’ is written as ' @ $ * ? ' and ARE is written as ‘ • £ ? ’ How can ‘REMOTE’ be written in that code?
(1) £ ? • $ @ ?
(2) @ ? * $ @ ?
(3) £ ? * $ @ ?
(4) Cannot be determined
(5) None of these
Sol: From the data we have
T - @
O - $
M - *
E - ?
A - •
R - £
E - ?
Hence REMOTE is coded as £ ? * $ @ ? So (3) is the answer.
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Questions With Answers Coding Decoding
1. If in a certain language CHAMPION is coded as HCMAIPNO, how can NEGATIVE be coded in that code?
(1) ENAGITEV
(2) NEAGVEIT
(3) MGAETVIE
(4) EGAITEVN
(5) NEGATIEV
2. In a certain language KINDLE is coded as ELDNIK, how can EXOTIC be coded in that code?
(1) EXOTLC
(2) CXOTIE
(3) COXITE
(4) CITOXE
(5) EOXITC
3. If in a certain language GAMBLE is coded as FBLCKF, how can FLOWER be coded in that language?
(1) GKPVFQ
(2) EMNXDS
(3) GMPVDS
(4) HNQYGT
(5) EKNVDQ
4. If in a certain language FASHION is coded as FOIHSAN, how can PROBLEM be coded in that code?
(1) ROBLEMP
(2) PLEBRUM
(3) PRBOELM
(4) RPBOELM
(5) PELBORM
5. If FRIEND is coded as HUMJTK, how can CANDLE be written in that code?
(1) EDRIRL
(2) DCQHQK
(3) ESJFME
(4) FYOBOC
(5) DEQJQM
6. If in a certain code, TWENTY is written as 863985 and ELEVEN is written as 323039, how can TWELVE be written in that code?
(1) 863203
(2) 863584
(3) 863903
(4) 863063
(5) None of these
7. If PALE is coded as 2134, EARTH is coded as 41590, how can is PEARL be coded in that language?
(1) 29530
(2) 24153
(3) 25413
(4) 25430
(5) None of these
8. If ROSE is coded as 6821, CHAIR is coded as 73456 and PREACH is coded as 961473, what will be the code for SEARCH?
(1) 246173
(2) 214673
(3) 214763
(4) 216473
(5) None of these
9. In a certain code nee tim see means how are you ; ble nee see means where are you. What will be the code for where?
(1) nee
(2) tim
(3) see
(4) Cannot be determined
(5) None of these
10. In a certain code language pit nae tom means apple is green ; nae ho tap means green and white and ho tom ka means shirt is white. Which of the following represents apple in that language?
(1) nae
(2) tom
(3) pit
(4) ho
(5) ka
11. If nitco sco tingo stands for softer than flower, tingo rho mst stands for sweet flower fragrance and mst sco tmp stands for sweet than smile what would fragrance stand for?
(1) rho
(2) mst
(3) tmp
(4) sco
(5) None of these
12. In a certain code language, 743 means Mangoes are good, 657 means Eat good food, and 934 means Mangoes are ripe. Which digit means ripe in that language?
(1) 5
(2) 4
(3) 9
(4) 7
(5) Cannot be determined
13. In a certain code, 247 means spread red carpet, 256 means dust one carpet and 234 means one red carpet which digit in that code means dust?
(1) 2
(2) 3
(3) 5
(2) 3
(3) 5
(4) 6
(5) Cannot say
(5) Cannot say
14. In a certain code language, 134 means good and tasty, 478 means see good pictures, and 729 means pictures are faint. Which of the following digits stands for see?
(1) 4
(2) 7
(3) 9
(2) 7
(3) 9
(4) 8
(5) None of these
(5) None of these
15. In a certain code 253 means books are old, 546 means man is old and 378 means buy good books. What stands for ‘are’ in that code?
(1) 2
(2) 4
(3) 5
(2) 4
(3) 5
(4) 6
(5) 9
(5) 9
16. In a certain code language TSSNOFFQ is written as STRONGER then GQFDENN will be written as
(1) DOMEERF
(2) FEEDORM
(3) FREEDOM
(2) FEEDORM
(3) FREEDOM
(4) FREEDMO
(5) None of these
(5) None of these
17. If FULFNHW is the code for CRICKET, EULGH will be coded as
(1) PRIDE
(2) BRIDE
(3) BLADE
(2) BRIDE
(3) BLADE
(4) BLIND
(5) None of these
(5) None of these
18. If in a certain language REMOTE is coded as ROTEME, which word would be coded as PNIICC?
(1) NPIICC
(2) PICCIN
(3) PINCIC
(2) PICCIN
(3) PINCIC
(4) PICNIC
(5) PICINC
(5) PICINC
Directions (19-21): The number in each question below is to be codified in the following code.
Digit: 5 3 7 1 4 9 6 2 8
Letter: C J O X N Q T Z F
19. 163542
(1) XTJCNZ
(2) TXJCNZ
(3) XTJCZN
(2) TXJCNZ
(3) XTJCZN
(4) XTCJNZ
(5) None of these
(5) None of these
20. 925873
(1) ZQCFOJ
(2) QZCFOJ
(3) QZCOFJ
(2) QZCFOJ
(3) QZCOFJ
(4) QZCFJO
(5) None of these
(5) None of these
21. 741568
(1) ONCXTF
(2) NOXCFT
(3) ONCFCT
(2) NOXCFT
(3) ONCFCT
(4) ONXCTF
(5) None of these
(5) None of these
22. In a certain code ORANGE is written as ? ÷ @ • + * and EAT is written as ‘ * @ $’. How can ROTATE be written in that code?
(1) ÷ ? $ @ * $
(2) ÷ ? $ @ • *
(3) ÷ ? $ @ $ *
(2) ÷ ? $ @ • *
(3) ÷ ? $ @ $ *
(4) ÷ ? $ * • @
(5) None of these
(5) None of these
23. In a certain code ‘PALM’ is written as ‘ £ @ ? $ ’ and ‘ARM’ is written as ‘ @ * $ ’. How can ‘ALARM’ be written in that code?
(1) @ £ @ ? $
(2) @ $ ? £ @
(3) ? @ @ £ $
(2) @ $ ? £ @
(3) ? @ @ £ $
(4) @ ? @ £ $
(5) None of these
(5) None of these
24. In a certain code ‘HEAT’ is written as ‘ ? * $ @ ’ and ‘FINGER’ is written as ‘ £ • & * #’. How can ‘FATHER’ be written in that code?
(1) $ @ ? * #
(2) $ @ ? # *
(3) @ ? # $ *
(2) $ @ ? # *
(3) @ ? # $ *
(4) $ @ ? # *
(5) None of these
(5) None of these
25. In a certain code ‘BODE’ is written as ‘ @ $ * ? ’ and ‘EAT’ is written as ‘ ? • £ ’ How can ‘DEBATE’ be written in that code?
(1) ? * @ * £ •
(2) * ? @ • £ ?
(3) * ? @ * £ ?
(2) * ? @ • £ ?
(3) * ? @ * £ ?
(4) Cannot be determined
(5) None of these
2. (4) In the code the arrangement of the letters in the word is wholly reversed.
3. (2) The letters preceding the first, third and fifth letters of the given word and those succeeding the second, fourth and last letters of the word in the alphabet form the code.
4. (5) The 1st and the last letters of the word are kept as such in the code and all other letters in between them are wholly reversed.
5. (1) In the code, the first letter is the second alphabet, the second letter is the third alphabet, the third letter is the fourth alphabet and so on after the corresponding letter in the word.
6. (1) The letters are coded accordingly T as 8, W as 6, E as 3, L as 2, and V as 0. So TWELVE is coded as 863203.
7. (2) The letters are coded accordingly P as 2, E as 4, A as 1, R as 5 and L as 3. So PEARL is coded as 24153.
8. (2) The letters are coded accordingly S as 2, E as 1, A as 4, R as 6, C as 7 and H as 3. i.e., 214673
9. (5) In the first and the second statements the common words are ‘are’ and ‘you’ and the common code words are nee and see. So nee and see means are and you. In the second statement the remaining code ble means where.
10. (3) In the first and the second statements, the common code word is nae and the common word is green. So nae means green. In the first and the third statements, the common code word is tom and the common word is is so tom means is. Therefore in the first statement pit means apple.
11. (1) In the first and the second statements the common code is tingo and the common word is flower. So tingo means flower. In the second and the third statements, the common code is mst and the common word is sweet. So mst means sweet. Therefore in the second statement, rho means fragranee.
12. (3) In the first and the third statements, the common code digits are 4 and 3 ; and the common words are mangoes and are. So 4 and 3 are the codes for mangoes and are. Thus in the third statement 9 means ripe.
13. (3) In the first and the second statements, the common code digit is 2 and the common word is carpet. So 2 means carpet. In the second and the third statements, the common code digit is 6 and the common word is one. So 6 means one. Therefore in the second statement, 5 means dust.
14. (4) In the first and the second statements, the common code digit is 4 and the common word is good. So 4 stands for good. In the second and the third statements, the common code digit is 7 and the common word is pictures. So 7 stands for pictures. Thus in the second statement 8 stands for see.
15. (1) In the first and the second statements, the common code digit is 5 and the common word is old, so 5 stands for old. In the first and third statements, the common code digit is 3 and the common word is books so 3 stands for books. Thus in the first statement, 2 stands for are.
16. (3) The first letter is moved one step backward and second is moved one step forward the third letter is moved one step backward, the fourth letter one step forward and so on. So the answer is (3)
17. (2) Each letter of the word is three steps ahead of the corresponding letter of the code.
18. (4) The groups of second and third letters and fourth and fifth letters in the word interchange places in the code.
19. (1) As given 1 is coded as X, 6 is coded as T, 3 is coded as J, 5 is coded as C, 4 is coded as N and 2 is coded as Z. So 163542 is coded as XTJCNZ.
20. (2) As given 9 is coded as Q, 2 as Z, 5 as C, 8 as F, 7 as O and 3 as J. So 925873 is coded as QZCFOJ.
21. (4) 7 is coded as O, 4 as N, 1 as X, 5 as C, 6 as T and 8 as F. So 741568 is coded as ONXCTF.
22. (3) O R A N G E E A T
? ÷ @ • + * * @ $
So we can code ROTATE as ÷ ? $ @ $ *
23. (5)
P - £
A - @
L - ?
M - $
R - *
M - $
ALARM = @ ? @ $ £ *
24. (1)
H - ?
A - $
T - @
F -
I - £
N - •
G - &
E - *
R - #
FATHER = $ @ ? * #
25. (2)
B - @
O - $
D - *
E - ?
A - •
T - £
DEBATE = * ? @ • £ ?
(5) None of these
Answer Key
1. (1) 2. (4) 3. (2) 4. (5) 5. (1)
6. (1) 7. (2) 8. (2) 9. (5) 10. (3)
11. (1) 12. (3) 13. (3) 14. (4) 15. (1)
16. (3) 17. (2) 18. (4) 19. (1) 20. (2)
21. (4) 22. (3) 23. (5) 24. (1) 25. (2)
Solutions
1. (1) In the code each of the two letters are reversed in arrangement.2. (4) In the code the arrangement of the letters in the word is wholly reversed.
3. (2) The letters preceding the first, third and fifth letters of the given word and those succeeding the second, fourth and last letters of the word in the alphabet form the code.
4. (5) The 1st and the last letters of the word are kept as such in the code and all other letters in between them are wholly reversed.
5. (1) In the code, the first letter is the second alphabet, the second letter is the third alphabet, the third letter is the fourth alphabet and so on after the corresponding letter in the word.
6. (1) The letters are coded accordingly T as 8, W as 6, E as 3, L as 2, and V as 0. So TWELVE is coded as 863203.
7. (2) The letters are coded accordingly P as 2, E as 4, A as 1, R as 5 and L as 3. So PEARL is coded as 24153.
8. (2) The letters are coded accordingly S as 2, E as 1, A as 4, R as 6, C as 7 and H as 3. i.e., 214673
9. (5) In the first and the second statements the common words are ‘are’ and ‘you’ and the common code words are nee and see. So nee and see means are and you. In the second statement the remaining code ble means where.
10. (3) In the first and the second statements, the common code word is nae and the common word is green. So nae means green. In the first and the third statements, the common code word is tom and the common word is is so tom means is. Therefore in the first statement pit means apple.
11. (1) In the first and the second statements the common code is tingo and the common word is flower. So tingo means flower. In the second and the third statements, the common code is mst and the common word is sweet. So mst means sweet. Therefore in the second statement, rho means fragranee.
12. (3) In the first and the third statements, the common code digits are 4 and 3 ; and the common words are mangoes and are. So 4 and 3 are the codes for mangoes and are. Thus in the third statement 9 means ripe.
13. (3) In the first and the second statements, the common code digit is 2 and the common word is carpet. So 2 means carpet. In the second and the third statements, the common code digit is 6 and the common word is one. So 6 means one. Therefore in the second statement, 5 means dust.
14. (4) In the first and the second statements, the common code digit is 4 and the common word is good. So 4 stands for good. In the second and the third statements, the common code digit is 7 and the common word is pictures. So 7 stands for pictures. Thus in the second statement 8 stands for see.
15. (1) In the first and the second statements, the common code digit is 5 and the common word is old, so 5 stands for old. In the first and third statements, the common code digit is 3 and the common word is books so 3 stands for books. Thus in the first statement, 2 stands for are.
16. (3) The first letter is moved one step backward and second is moved one step forward the third letter is moved one step backward, the fourth letter one step forward and so on. So the answer is (3)
17. (2) Each letter of the word is three steps ahead of the corresponding letter of the code.
18. (4) The groups of second and third letters and fourth and fifth letters in the word interchange places in the code.
19. (1) As given 1 is coded as X, 6 is coded as T, 3 is coded as J, 5 is coded as C, 4 is coded as N and 2 is coded as Z. So 163542 is coded as XTJCNZ.
20. (2) As given 9 is coded as Q, 2 as Z, 5 as C, 8 as F, 7 as O and 3 as J. So 925873 is coded as QZCFOJ.
21. (4) 7 is coded as O, 4 as N, 1 as X, 5 as C, 6 as T and 8 as F. So 741568 is coded as ONXCTF.
22. (3) O R A N G E E A T
? ÷ @ • + * * @ $
So we can code ROTATE as ÷ ? $ @ $ *
23. (5)
P - £
A - @
L - ?
M - $
R - *
M - $
ALARM = @ ? @ $ £ *
24. (1)
H - ?
A - $
T - @
F -
I - £
N - •
G - &
E - *
R - #
FATHER = $ @ ? * #
25. (2)
B - @
O - $
D - *
E - ?
A - •
T - £
DEBATE = * ? @ • £ ?