Question

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

11, 23, 37, 53, 71, ?
1. 83
2. 91
3. 93
4. 98
5. 87

Answer 1

Correct Answer - Option 2 : 91

Calculation∶

The series follows following pattern

9 × 1 + 2 = 11

10 × 2 + 3 = 23

11 × 3 + 4 = 37

12 × 4 + 5 = 53

13 × 5 + 6 = 71

14 × 6 + 7 = 91

∴ The value of ? is 91