Aptitude - Odd Man Out and Series - Discussion

Find out the wrong number in the series.

2. 

1, 1, 2, 6, 24, 96, 720

[A]. 720
[B]. 96
[C]. 24
[D]. 6
[E]. 2

Answer: Option B

Explanation:

Go on multiplying with 1, 2, 3, 4, 5, 6 to get next number.

So, 96 is wrong.


Santhosh said: (Aug 13, 2011)  
I could not understand this problem, can you explain clearly please?

Cemi said: (Aug 30, 2011)  
I also could not understand this.

Menaga said: (Sep 26, 2011)  
Go on multiflying with 1,2,3,4,5,6....

1*1=1
1*2=2
2*3=6
6*4=24
24*5=120
120*6=720

The correct answer is 120. So 96 is the wrong number in the given series.

Pavan said: (Sep 22, 2013)  
Series can be written as 1, 1!, 2!, 3!, 4!, 5!, 6! = 1, 1, 2, 6, 24, 120, 720.

So odd number is 96 in given series.

Sweta said: (Oct 2, 2013)  
1*1=1
1*2=2
2*3=6
6*4=24
24*5=120
120*6=720

So, 96 is not correct.

Athira said: (Jul 9, 2015)  
Thanks for your clarification.

Karthik said: (Jun 23, 2016)  
Factorials: i.e o!, 1!, 2!, 3!, ....

Mounika said: (Dec 20, 2016)  
Thanks for your wonderful explanation @Menaga.

Sakshi Deo said: (Jan 22, 2018)  
I didn't understand the significance of 1 two times in the series!

Any justification?

Galactic said: (Feb 20, 2018)  
Correct series is 0! 1! 2! 3! 4! 5! 6!.

5! is 120 not 96.

Fazeena said: (May 25, 2018)  
Thanks for the given explanation. Thank you all.

Rm Mukesh said: (Mar 27, 2020)  
The pattern is *1, *2, *3, *4.

So, the missing term = 24x5 = 120.

Arnav said: (Jan 7, 2022)  
Thank you, this is very helpful for me.

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