Logical Reasoning

Sequence & Series

Medium

A series of letters and numbers is given, the terms of which follow certain definite pattern in groups. However, some terms in the series are missing. Choose the correct sequence from the options.

Z 24 _ Y _ B _ 18 C W 15 _

(A) X

(B) D

(C) 21

(D) A

Choose the correct answer from the options given below:

(A), (B), (C), (D)

(B), (C), (A), (D)

(D), (C), (A), (B)

(D), (C), (B), (A)

✅ Correct Option: 3

Split the series into groups of three: (Z, 24, ?), (Y, ?, B), (?, 18, C), (W, 15, ?).

The first letters run backwards Z, Y, X, W. The numbers fall by $3$ : $24, 21, 18, 15$ . The last letters run forward A, B, C, D.

So the blanks are A, 21, X, D, that is (D), (C), (A), (B).

2023: 28 May Shift 1

Complete the series,

3, 12, 27, 48, 75, 108, ?

2026: 29 May Shift 2

Which number will replace the question mark (?) in the following series?

1, 2, 6, 12, ? , 72, 216

2025: 19 May Shift 2

In the given letter series, some of the letters are missing which are given in that order as one of the following alternatives. Choose the correct alternative.

_a_b_abaa_bab_abb

2025: 13 May Shift 2

Study the series given below and locate the number that is missing:

5, 10, 17, 26, ____

2025: 15 May Shift 1

The missing number in the sequence 2, 15, 41, 80, 132, ?, is:

2026: 25 May Shift 1

Find the next term in the series: BMO, EOQ, HQS, ?

Solution

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