Question

1, 3, 12, 25, 45,... find out the wrong series.

Answer 1

the difference is 2,9,13,20

there is no any similarity so the question is wrong

Answer 2

Given series - 1 , 3 , 12 , 25 , 45

1
3
(1+2)
(2+5)
(4+5)

1 , 3 , 5 , 7 , 9

but sequence is 1 , 3 , 3 , 7 , 9

therefore (1+2) is wrong