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

In a certain code, CASH is written as EDWM, where the shifts applied to the successive letters are +2, +3, +4, +5. Using the same rule, how will PAID be written?

PAID is coded as RDMI. The rule adds 2, 3, 4 and 5 to the positions of the successive letters, so P becomes R, A becomes D, I becomes M and D becomes I, as confirmed by CASH becoming EDWM.

  1. ARDMICorrect
  2. BRDNI
  3. CRCMI
  4. DQDMI

Explanation

Apply +2, +3, +4, +5 to P, A, I, D. P(16)+2=18=R; A(1)+3=4=D; I(9)+4=13=M; D(4)+5=9=I. So the code is RDMI. Check with CASH: C+2=E, A+3=D, S+4=W, H+5=M, which matches EDWM.

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