Coding Decoding - Important Points
Coding Decoding
Coding Decoding is one of the most important topics in reasoning. Coding decoding questions are asked in all competitive exams. It is basically a test to candidate’s ability to decipher the code language. In each question of this topic a word and coded form of the word will be given to the student. A student will required to decode the logic behind this coding and then apply the logic to another given word to find the answer in form of a code.
Types of coding decoding questions
The questions on coding and decoding are basically of three types as given below.
Letter to letter coding
Example: In a certain code ‘SAVER’ is written as ‘RZUDQ’, how will PATNA be coded then?
a) OZTMZ
b) OZSMZ
c) QBUMB
d) OZTZM
Solution: Each letter is coded as the letter previous to it, PATNA will become OZSMZ. Hence the answer is (b).
Example: If BLUE is coded as CNXI, then PINK will be coded as :
a) PQML
b) QJOL
c) QKQO
d) QKQQ
Solution: (c) The coded word is obtained as +1, +2, +3, +4…
Word to word coding
Example: In a certain code ‘615’ means ‘coffee is hot’; ‘18’ means ‘hot soup’; and ‘895’ means ‘soup is sour’. What number will indicate the word ‘sour’?
a) 9
b) 8
c) 5
d) 6
Solution: The code for ‘hot’ is 1. So, the code of ‘soup’ is 8. Now the code of ‘is’ is 5. Hence we can say that the code of ‘sour’ is 9. So, the answer is (a)
Example: If ‘white’ is called ‘pink’, ‘pink’ is called ‘blue’, ’blue’ is called ‘brown’, ‘brown’ is called ‘orange’, ‘orange’ is called ‘violet’, ‘ violet’ is called ‘red’ and ‘red’ is called ‘white’, what is the colour of blood ?
a) white
b) brown
c) blue
d) orange
Solution: As the colour of blood is red and red is called white in the given coded language. So the colour of blood is white in the given coded language. So the answer is (a)