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Question

What should come in place of the question mark (?) in the given series based on the English alphabetical order?
CMA GQF KUK OYP ?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
SCU

Series Pattern Analysis

The series consists of three-letter terms. We need to find the pattern governing the sequence of these terms based on English alphabetical order.

  • Term 1: CMA
  • Term 2: GQF
  • Term 3: KUK
  • Term 4: OYP

Alphabetical Position Mapping

Assign numerical positions to each letter (A=1, B=2, ..., Z=26) to identify the progression.

Term 1: C(3), M(13), A(1)

Term 2: G(7), Q(17), F(6)

Term 3: K(11), U(21), K(11)

Term 4: O(15), Y(25), P(16)

Pattern Progression

First Letter Progression

Analyze the first letters: C(3), G(7), K(11), O(15). The difference between consecutive positions is consistently +4.

Calculation: \(3 + 4 = 7\) (G); \(7 + 4 = 11\) (K); \(11 + 4 = 15\) (O).

The next first letter is \(15 + 4 = 19\). The 19th letter is S.

Second Letter Progression

Analyze the second letters: M(13), Q(17), U(21), Y(25). The difference is consistently +4.

Calculation: \(13 + 4 = 17\) (Q); \(17 + 4 = 21\) (U); \(21 + 4 = 25\) (Y).

The next second letter is \(25 + 4 = 29\). Using modulo arithmetic for alphabet wrap-around (\(29 \pmod{26}\)), we get 3. The 3rd letter is C.

Third Letter Progression

Analyze the third letters: A(1), F(6), K(11), P(16). The difference is consistently +5.

Calculation: \(1 + 5 = 6\) (F); \(6 + 5 = 11\) (K); \(11 + 5 = 16\) (P).

The next third letter is \(16 + 5 = 21\). The 21st letter is U.

Determining the Missing Term

By combining the derived next letters for each position (S, C, U), the missing term in the series is SCU.

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Important Questions from Alphabet Series

  1. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    G _ C T _ X _ T G X _ T _ X C T G _ C T

  2. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    Q _ P _ M _ A _ T _ Q A _ T M

  3. Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

    r _ x l _ q _ _ x _ p q _ e _ l p _

  4. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

    BKR, DNV, FQZ, ?, JWH

  5. Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

    AU, BO, CI, DE, ?

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