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.