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CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out

If in a coding system, RAJESH is coded as 18-1-10-5-19-8 using A=1, B=2, C=3, ... Z=26, what would be the code for APURVA?

In the standard positional cipher where A=1 through Z=26, each letter is replaced by its position. APURVA decodes as: A(1), P(16), U(21), R(18), V(22), A(1), giving 1-16-21-18-22-1. This is verified against the given RAJESH code pattern.

  1. A1-16-21-18-22-1Correct
  2. B1-17-22-19-23-2
  3. C1-16-20-17-21-1
  4. D2-16-21-18-22-1

Explanation

Using the standard alphabet position code where A=1, B=2, C=3, ... Z=26: A=1, P=16, U=21, R=18, V=22, A=1. So APURVA = 1-16-21-18-22-1. The verification for RAJESH: R=18, A=1, J=10, E=5, S=19, H=8, which matches the given code 18-1-10-5-19-8. Option B shifts values incorrectly. Option C miscounts U and R. Option D incorrectly starts with 2 instead of 1.

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