Discussion of Question with ID = 108 under Missing-Numbers

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Question

One number is wrong in the series. Find the wrong number.

4, 9, 19, 43, 90, 185, 375

A

9

B

19

C

90

D

185

Soln.
Ans: b

Series follows the pattern: 4 × 2 + 1 = 9, 9 × 2 + 2 = 20, 20 × 2 + 3 = 43, 43 × 2 + 4 = 90 and so on. Hence, the number 19 should be replaced by 20. So 19 is wrong.

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