Question

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

10, 21, 65, 263, ?

1. 265
2. 1315
3. 1313
4. 1319
5. 1320

Answer 1

Correct Answer - Option 4 : 1319

Calculation:

⇒ 10 × 2 + 1 = 21

⇒ 21 × 3 + 2 = 65

⇒ 65 × 4 + 3 = 263

⇒ 263 × 5 + 4 = 1319

∴ The missing number is 1319.