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

65, 66, 134, 405, ? 


1. 650
2. 1624
3. 1520
4. 1810
5. 408

1 Answer

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Best answer
Correct Answer - Option 2 : 1624

Calculation:

The series follows the pattern:

⇒ 65 × 1 + 1 = 66

⇒ 66 ×  2 + 2 = 132 + 2 =  134

⇒ 134 × 3 + 3 = 402 + 3 = 405

⇒ 405 × 4 + 4 = 1620 + 4 = 1624

∴ The next number of this series is 1624.

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