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

In a certain code, digits are replaced by letters as 1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H, 9=I and 0=J. How will the number 3105 be written in this code?

3105 is written as CAJE. Using the given substitution, 3 is C, 1 is A, 0 is J and 5 is E, and writing these in order gives CAJE.

  1. ACAJF
  2. BCIJE
  3. CCAOE
  4. DCAJECorrect

Explanation

Replace each digit: 3 becomes C, 1 becomes A, 0 becomes J, 5 becomes E. The code is CAJE. CAJF wrongly gives 5 the letter F.

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