Which letter-cluster will replace the question mark (?) in the following series? CBD, XYM, FEG, UVT, IHJ, ?
A.RQS✓ Correct
B.ORP
C.RSQ
D.STR
Explanation
Each pair of clusters sums to 27 in positional values: C+X=27, B+Y=27, D+W=27 and F+U=27, E+V=27, G+T=27; similarly I+R=27, H+S=27, J+Q=27. So the answer is RQS.
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