New Free Workshop on RBI Grade B Descriptive Answer Writing - Join Us!
Register

Question

Find the wrong number in the following number series:

5 11 23 43 85 171 341

A 23 Correct Answer Incorrect Answer
B 85 Correct Answer Incorrect Answer
C 171 Correct Answer Incorrect Answer
D 341 Correct Answer Incorrect Answer
E 11 Correct Answer Incorrect Answer

Solution

5 × 2 + 1 = 11
11 × 2 - 1 = 21
21 × 2 + 1 = 43
43 × 2 - 1 = 85
85 × 2 + 1 = 171
171 × 2 - 1 = 341

Practice Next

Relevant for Exams:

×
×