Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. C F J, H K O, M P T, ?
RUY
Logic: Within each cluster, the gap between letters is +3 and +4. The first letters of the four clusters jump by +5 each time.
Step 1 – within-cluster pattern: C(3) → F(6) → J(10) [+3, +4]; H(8) → K(11) → O(15) [+3, +4]; M(13) → P(16) → T(20) [+3, +4].
Step 2 – first-letter pattern: C(3) → H(8) → M(13) → R(18) [+5 each step].
Step 3 – build the missing cluster: R(18) → U(21) → Y(25), giving RUY.
Hence the answer is RUY.
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