Select the letter-cluster from among the given options that can replace the question mark (?) in the following
series. CFI, HJL, MNO, RRR, ?

Question

Accepted Answer

1. Find positions: C(3), H(8), M(13), R(18). Each first letter adds $+5$, so next is 23 = W.
2. Second letters: F(6), J(10), N(14), R(18) add $+4$, so next is 22 = V.
3. Third letters: I(9), L(12), O(15), R(18) add $+3$, so next is 21 = U.
4. Combine to get **WVU**.

FINAL_ANSWER: a

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Answer

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