# Aptitude - Odd Man Out and Series - Discussion

### Discussion :: Odd Man Out and Series - Find Wrong No. (Q.No.1)

Find out the wrong number in the series.

1.

7, 8, 18, 57, 228, 1165, 6996

 [A]. 8 [B]. 18 [C]. 57 [D]. 228 [E]. 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.

 Parikshit Sahoo said: (Oct 5, 2010) I didn't get how the answer is 228. Can you please explain ?

 Sundar said: (Oct 5, 2010) 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?

 Rita said: (Oct 13, 2010) Wow.

 Satyam said: (Jan 11, 2011) Thanks Sundar.

 Hari said: (Jun 29, 2011) Good sundar.

 Satya said: (Dec 2, 2011) I can't undestand.

 Nandini said: (Mar 7, 2013) 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: (Dec 19, 2015) I can't understand this logic sir. Can you please explain?

 Arjun said: (Apr 14, 2016) This is simple method @Jeeva. Try yourself to understand.

 Karge said: (May 25, 2016) Nice explanation. Thank you guys.

 Shariq said: (Aug 3, 2016) Thanks @Sundar and @Nandini! Logic is very clear and understandable.

 Fatima said: (Sep 12, 2016) Thanks to all.

 Tapan Ghosh said: (Oct 10, 2016) Thanks @Nandini and @Sundar. Logic is very easy after your explanation.

 Vikram Kumar said: (Oct 27, 2016) It is understanding for me. Thanks for the explanation.

 Sree said: (Jan 24, 2017) Thanks @Sundar and @Nandini.

 Niharika said: (May 17, 2017) It can also be done as: A, (A+1)X1, (B+1)X2, (C+1)X3, (D+1)X4, (E+1)X5, (F+1)X6. i.e., A = 7. B = (7+1)X1 = 8. C = (8+1)X2 = 18. D = (18+1)X3 = 57. E = (57+1)X4 = 232. F = (232+1)X5 = 1165.

 Suvra Saurav said: (Oct 5, 2017) Can any one solve this for me? 96, 169, 144, 121, 101 find the wrong number.

 Girish said: (Jan 4, 2018) @Suvra Saurav I think may be 96 is 196. Because 196- 14^2. 169- 13^2 144- 12^2 121- 11^2 And there is "101" wrong number.

 Geetika Rana said: (Apr 13, 2018) I agree @Girish. I also have the same value 196.

 Shreyansh Jain said: (May 28, 2019) Thanks @Sundar.

 Sushant said: (Jul 10, 2019) Nice, thanks @Sundar.