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

In a certain code language, each letter of a word is replaced by the letter that is its mirror position in the alphabet (A becomes Z, B becomes Y, and so on). How will the word FIRM be written in this code?

FIRM is coded as URIN. Each letter is replaced by its mirror letter, found by subtracting its position from 27: F becomes U, I becomes R, R becomes I and M becomes N, giving URIN.

  1. AURINCorrect
  2. BUIRN
  3. CURNI
  4. DVIRN

Explanation

Mirror letter of position n is 27 - n. F(6)->21=U, I(9)->18=R, R(18)->9=I, M(13)->14=N. So FIRM becomes URIN. UIRN wrongly swaps the middle letters, so it is not the mirror coding.

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