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### 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.