Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? GDK 12 NKR 23 URY 34 BYF 45 ?
IFM 56
Look at the first letters of the clusters: G, N, U, B, ? Each first letter jumps +7 places: G(7)→N(14)→U(21)→B(28, wrapping past Z)→I(35, i.e. 9). So the next first letter is I.
Look at the second letters: D, K, R, Y, ? Each moves +7: D(4)→K(11)→R(18)→Y(25)→F(32, i.e. 6). So the next second letter is F.
Look at the third letters: K, R, Y, F, ? Again +7: K(11)→R(18)→Y(25)→F(32, i.e. 6)→M(39, i.e. 13). So the next third letter is M.
The numbers run 12, 23, 34, 45, each rising by 11, so the next number is 56.
Combining the letters and number gives IFM 56.
Hence, the missing cluster is IFM 56.
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