# 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 1 of 3.

Parikshit Sahoo said:   1 decade ago
I didn't get how the answer is 228. Can you please explain ?

Initial value = 7

7 x 1 + 1 = 8

8 x 2 + 2 = 18

18 x 3 + 3 = 57

57 x 4 + 4 = 232 (But given number 228 is out of pattern)

232 x 5 + 5 = 1165

1165 x 6 + 6 = 6996 ... and so on.

Hope you understand the logic behind this problem. Have a nice day?

Wow.

Thanks Sundar.

Good sundar.

I can't undestand.

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.

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

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

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