Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
XGC, UHD, RIF, OJI, ?
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Correct answer: (C) LKM
Explanation
First letters go back by 3 (X, U, R, O, L), second letters go forward by 1 (G, H, I, J, K), and third letters go forward by +1, +2, +3, +4 (C, D, F, I, M). So the next term is LKM.