Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?
OKI 4, QLG 8, SME 12, UNC 16, ?

This question was previously asked in
RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 1)
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  1. WOA 24
  2. WOA 16
  3. WOA 20
  4. WOV 24

Answer (Detailed Solution Below)

Option 3 : WOA 20
Free
RRB NTPC Graduate Level Full Test - 01
100 Qs. 100 Marks 90 Mins

Detailed Solution

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The logic followed here is:

O (15) K (11) I (9) 4
+2 ↓ +2 ↓ -2 ↓ +4 ↓
Q (17) L (12) G (7) 8
+2 ↓ +2 ↓ -2 ↓ +4 ↓
S (19) M (13) E (5) 12
+2 ↓ +2 ↓ -2 ↓ +4 ↓
U (21) N (14) C (3) 16
+2 ↓ +2 ↓ -2 ↓ +4 ↓
W (23) O (15) A (1) 20

Thus, the missing letter-number cluster in the series is WOA 20.

Hence, the correct answer is "Option 3".

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