Which letter cluster will replace the question mark (?) to complete the given series? WFBI, UCWB, SZRU, ?
A.QWMN
B.QWNN
C.QXNN
D.QXMN✓ Correct
Explanation
Each letter in the cluster decreases by a fixed amount: W→U→S→Q (−2 each), F→C→Z→X (−3 each, wrapping), B→W→R→M (−5 each), I→B→U→N (−7 each). So the next term is QXMN.
💡 Practice unlimited SSC CHSL PYQs + AI-tracked progress on each topic. Sign up free →