In each of the following number series the wrong number is given find out that number 5 9 18 33 65 1...........

Quantitative Aptitude (SBI-CL) Number series

In each of the following number series, the wrong number is given, find out that number.

5, 9, 18, 33, 65, 129

This questions was previously asked in

SBI Clerk Prelims (12 Jul, 2021 Shift 1)

129

- Let's examine the series: 5, 9, 18, 33, 65, 129.

- We suspect each number is about double the previous one, with a certain pattern.

- Check the differences:

- 9 - 5 = 4

- 18 - 9 = 9

- 33 - 18 = 15

- 65 - 33 = 32

- 129 - 65 = 64

- The differences should be increasing as double the previous:

- 4, then should be 8 (not 9), then 16 (not 15), then 32 (as part of powers of 2)

- The issue lies with 18; it breaks the doubling pattern.

- Correct Answer: Option 3 - 18

Submit Error