Question

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

18, 89, 355, ?, 2127

1. 1024
2. 1064
3. 545
4. 654
5. None of these

Answer 1

Correct Answer - Option 2 : 1064

Calculation:

The series follows the pattern,

⇒ 18 × 5 – 1 = 89

⇒ 89 × 4 – 1 = 355

⇒ 355 × 3 – 1 = 1064

⇒ 1064 × 2 – 1 = 2127

∴ The missing number is 1064.