Find the wrong number in the given series.

6, 5, 16, 32, 129, 644- 32
- 644
- 129
- 16
- 5

Option 4 : 16

Win over the concepts of Number Series and get a step ahead with the preparations for Quantitative Aptitude with Testbook.

The series follows the following pattern:

6 × 1 – 1 = 5

5 × 2 + 1 = **11**

11 × 3 – 1 = 32

32 × 4 + 1 = 129

129 × 5 – 1 = 644

∴ The wrong term in the given series is 16.
India’s **#1 Learning** Platform

Start Complete Exam Preparation

Daily Live MasterClasses

Practice Question Bank

Mock Tests & Quizzes

Trusted by 2,30,13,916+ Students

Testbook Edu Solutions Pvt. Ltd.

1st & 2nd Floor, Zion Building,

Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

[email protected]
Plot No. 273, Sector 10, Kharghar,

Navi Mumbai - 410210

Toll Free:1800 833 0800

Office Hours: 10 AM to 7 PM (all 7 days)