Question

Find the wrong number in the given number series?

10, 21, 54, 109, 189
A) 189
B) 109
C) 54
D) 21

Answer 1

Find the wrong number in the given number series?

10, 21, 54, 109, 189
A) 189
B) 109
C) 54
D) 21

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.

Answer 2

Here the numbers follow a pattern but the last no. 189 didn't


The last no. Should be 109+77=186

Hence a) 189 is the no.