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Question

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series:
B E Y, B I U, B M Q, B Q M, ?

This question was previously asked in
SSC CGL 2025 Tier 1 Question Paper (25-Sep-2025) (Shift 3)
The correct answer is
BUI

Analyzing the Letter Series Pattern

The given series is: B E Y, B I U, B M Q, B Q M, ?

We need to identify the pattern to find the missing letter cluster.

First Letter Consistency

The first letter in each cluster remains constant as 'B'.

Second Letter Progression

Consider the sequence of the second letters: E, I, M, Q.

Let's find their positions in the alphabet:

  • E is the 5th letter.
  • I is the 9th letter.
  • M is the 13th letter.
  • Q is the 17th letter.

The pattern in the positions is an arithmetic progression:

  • $9 - 5 = 4$
  • $13 - 9 = 4$
  • $17 - 13 = 4$

The common difference is 4. The next position will be $17 + 4 = 21$.

The 21st letter of the alphabet is U.

Third Letter Regression

Consider the sequence of the third letters: Y, U, Q, M.

Let's find their positions in the alphabet:

  • Y is the 25th letter.
  • U is the 21st letter.
  • Q is the 17th letter.
  • M is the 13th letter.

The pattern in the positions is an arithmetic progression:

  • $21 - 25 = -4$
  • $17 - 21 = -4$
  • $13 - 17 = -4$

The common difference is -4. The next position will be $13 - 4 = 9$.

The 9th letter of the alphabet is I.

Determining the Missing Cluster

Combining the constant first letter ('B') with the calculated second letter ('U') and third letter ('I'), we get the cluster BUI.

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Important Questions from Alphabet Series

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

    KMTC, EVOM, OQXG, IZSQ, ?

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

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