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Question

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

DIXC 6 JNBF 12 PSFI 18 VXJL 24 BCNO 30 ?

This question was previously asked in
RRB NTPC 2025 Under Graduate CBT 1 Question Paper PDF (20-Jun-2026) (Shift 3)
The correct answer is

HHRR 36

The numbers 6, 12, 18, 24, 30 increase by 6 each time, so the next number is 36.

Tracking the first letters D, J, P, V, B (wrapping around the alphabet): each increases by 6, giving the next letter \(B+6=H\).

The second letters I, N, S, X, C also increase by 5 each time, giving the next letter \(C+5=H\).

The third letters X, B, F, J, N increase by 4 each time, giving the next letter \(N+4=R\).

The fourth letters C, F, I, L, O increase by 3 each time, giving the next letter \(O+3=R\).

Hence, the missing cluster is HHRR 36.

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Similar Questions

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Important Questions from Alpha-numeric series

  1. What should come in place of the question mark (?) in the given series based on the English alphabetical order?
    DFA, HJE, LNI, PRM, ?

  2. What should come in place of the question mark (?) in the given series based on the English alphabetical order?
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  3. Which letter-cluster will replace the question mark (?) to complete the given series?
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  4. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
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