Question

What will come in place of question mark (?) in the following number series?

10, 11, 15, 24, ?, 65

1. 42
2. 45
3. 48
4. 35
5. 40

Answer 1

Correct Answer - Option 5 : 40

Given:

The number series:

10, 11, 15, 24, ?, 65

Concept Used:

Number series following a fixed pattern.

Calculation;

The given number series follows the pattern:

10 + 1² = 11

11 + 2² = 15

15 + 3² = 24

24 + 4² = 40

40 + 5² = 65

∴ The number in place of “?” in the given number series is 40