alleryFind the next letter in the series: C, D, F, I, ?
AM
BG
CN
DP
Answer & Solution
Correct answer: A. M
1. Positions of letters: C=3, D=4, F=6, I=9.
2. Differences are +1, +2, +3, so the next gap is +4.
3. 9 + 4 = 13, which is the letter M.
_Source: RRB Group D CEN-02/2018 PYQ, Q.98._
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