Discussion of Question with ID = 134 under Missing-Numbers

This is the discussion forum for this question. If you find any mistakes in the solution, or if you have a better solution, then this is the right place to discuss. A healthy discussion helps all of us, so you are requested to be polite and soft, even if you disagree with the views of others. The question and its current solution has also been given on this page.

Advertisement

Question

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

2, 5, 11, 27, 58, 121, 248

A

5

B

11

C

27

D

58

Soln.
Ans: b

Number 11 is wrong and should be replaced by 12. The series is 2 X 2 + 1 = 5, which gives 5 X 2 + 2 = 12, which gives 12 X 2 + 3 = 27, and so on. So the third item should be 12, not 11.

Comments and Discussion