Find the wrong number in the given number series? 10, 21, 54, 109, 189

Question

Find the wrong number in the given number series?

10, 21, 54, 109, 189


A. 189
B. 109
C. 54
D. 21

Answer: A

Solution:

The given number series is 10, 21, 54, 109, 189

The series follows a pattern that 10 + 11 = 21

21 + 33 = 54

54 + 55 = 109

109 + 77 = 186

Hence the wrong number in the given number series is 189.

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