# Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Find Wrong No. (Q.No. 1)
Directions to Solve
Find out the wrong number in the series.

1.
7, 8, 18, 57, 228, 1165, 6996
8
18
57
228
1165
Explanation:

Let the given numbers be A, B, C, D, E, F, G.

Then, A, A x 1 + 1, B x 2 + 2, C x 3 + 3, D x 4 + 4, E x 5 + 5, F x 6 + 6 are the required numbers.

Clearly, 228 is wrong.

Discussion:
22 comments Page 2 of 3.

Fatima said:   8 years ago
Thanks to all.

Shariq said:   8 years ago
Thanks @Sundar and @Nandini! Logic is very clear and understandable.

Karge said:   8 years ago
Nice explanation. Thank you guys.

Arjun said:   8 years ago
This is simple method @Jeeva. Try yourself to understand.

Jeeva said:   9 years ago
I can't understand this logic sir. Can you please explain?

The given series 7, 8, 18, 57, 228, 1165, 6996

And the given series in the format of

A, AX1+1, BX2+2, CX3+3, DX4+4, EX5+5, FX6+6, GX7+7

BECAUSE CHECK THE SERIES

A=7
AX1+1=7X1+1=8
BX2+2=8X2+2=18
CX3+3=18x3+3=57
Dx4+4=57x4+4=232 < Here is the wrong>
Ex5+5=232x5+5=1165 This is the process.

I can't undestand.