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Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? CER121, IKX98, O
Question

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
CER121, IKX98, OQD75, UWJ52, ?

A.

BCP29

B.

ACP29

C.

ADP29

D.

ACQ29

Correct option is B

Given:

​CER121, IKX98, OQD75, UWJ52, ?

​Logic: 1st, 2nd, and 3rd letters are each increased by +6 (with wrap-around), while the number decreases by 23 in each step.
1st letters:
C +6 → I +6 → O +6 → U +6 → A
2nd letters:
E +6 → K +6 → Q +6 → W +6 → C
3rd letters:
R +6 → X +6 → D +6 → J +6 → P
Numbers:
121 −23 → 98 −23 → 75 −23 → 52 −23 → 29
Hence, the next cluster is ACP29.​
Correct Answer: (B) ACP29

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