What should come in place of the question mark '?' in the following nu – InterviewSolution

InterviewSolution

1.

What should come in place of the question mark '?' in the following number series?4, 5, 4, 9, ?, 52, 1551. 192. 203. 174. 185. 21

Answer» Correct Answer - Option 3 : 17

Calculation∶

The series follows following pattern

4 × 1 + 1 = 5

5 × 1 - 1 = 4

4 × 2 + 1 = 9

9 × 2 - 1 = 17

17 × 3 + 1 = 52

52 × 3 - 1 = 155

∴ The value of ? is 17

Discussion

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