Aptitude - Odd Man Out and Series - Discussion

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

Answer: Option D

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.

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