Question

In following number series only one number is wrong. Find out that wrong or odd number in the series?

6, 78, 858, 7722, 54055, 270270
A) 270270
B) 54055
C) 7722
D) 858

Answer 1

In following number series only one number is wrong. Find out that wrong or odd number in the series?

6, 78, 858, 7722, 54055, 270270
A) 270270
B) 54055
C) 7722
D) 858

The terms of the given series is 1*1, 2*2 + 1, 3*3, 4*4 +1, 5*5, 6*6 + 1, . . . . .
So, 15 is wrong and must be replaced by (4*4 + 1) = 17

Answer 2

So 15 is the wrong number and must be replaced by 17