Question

What should come in place of the question mark '?' in the following number series?

19, 20, 42, 129, 520, ?

1. 2505
2. 2405
3. 2605
4. 2305
5. 2705

Answer 1

Correct Answer - Option 3 : 2605

Given:

19, 20, 42, 129, 520, ?

Calculation:

The given series follows the pattern shows below:

19 × 1 + 1 = 20

20 × 2 + 2 = 42

42 × 3 + 3 = 129

129 × 4 + 4 = 520

520 × 5 + 5 = 2605

∴ The value of ? will be 2605.