IGDTUW 2025 — Reasoning PYQ

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Question

IGDTUW 2025 — Reasoning PYQ

IGDTUW | Reasoning | 2025

In the following series, replace the question mark (?) with the suitable option.

$15, 23, 31, 39, ?, 55, 63$

Choose the correct answer:

Explanation

Step 1: Identify the pattern

Let's analyze the difference between consecutive terms in the series:

$23 - 15 = 8$
$31 - 23 = 8$
$39 - 31 = 8$

The series follows an arithmetic progression where each term increases by a constant value of $8$ .

Step 2: Find the missing term

Since the pattern is to add $8$ to the previous term:

$Missing term = 39 + 8 = 47$

Step 3: Verify the pattern

Check if the next terms follow this rule:

$47 + 8 = 55$
$55 + 8 = 63$

The pattern holds true for the entire series.

Conclusion:

The missing number is 47. Therefore, the correct option is (b).