Aptitude - Odd Man Out and Series - Discussion

Find out the wrong number in the series.

8. 

6, 12, 48, 100, 384, 768, 3072

[A]. 768
[B]. 384
[C]. 100
[D]. 48
[E]. 12

Answer: Option C

Explanation:

Each even term of the series is obtained by multiplying the previous term by 2.

2nd term = (1st term) x 2 = 6 x 2 = 12

4th term = (3rd term) x 2 = 48 x 2 = 96.

6th term = (5th term) x 2 = 384 x 2 =768.

4th term should be 96 instead of 100.


Ashik Mohammed Nazar said: (Jun 7, 2011)  
You can easily guess it because, 100 is the only number that is not divisible by 6 in the above series !!!

Kannan.G said: (Feb 18, 2012)  
Explanation given is not correct because the 7'th term is not equal to 6'th term*2. Think the reason is all the other numbers are multiples of 6 except 100.

Dhanu said: (Feb 19, 2012)  
6, 12, 48, 100, 384, 768, 3072.

Divide the num by 2 = 3, 6, 24, 50, 194, 384, 1536 all the number divided by two there is odd.

Divide the number by 3 = 2, 4, 16, 100, 128, 256, 1024 here 100 is not divided by 3.

So 100 is odd.

Dhanu said: (Feb 19, 2012)  
7th term = (6th term) * 2 = 768 * 2 = 1536

so above the explanation is wrong coz 7th term not equal to 3072.

Ankit said: (Mar 11, 2012)  
3072/768=4
768/384=2
384/96=4(Here instead of 100, 96 should have been the correct sequence no.)
96/48=2
48/12=4
12/6=2

Remainder is alternatingly 4 & 2

Praveen Kumar said: (Jun 6, 2012)  
Sol:1st term into 2; (6*2=12)
2nd term into 4; (12*4=48)
3rd term into 2; (48*2=96)
4th term into 4; (96*4=384)
5th....
6th.... So on

Tiyasa Majumdar said: (Mar 25, 2014)  
The above explanation is wrong but answer is correct.

The logic is:

6*2 = 12.
12*4 = 48.
48*2 = 96.
96*4 = 384.
384*2 = 768.
768*4 = 3072.

So, the odd one is 100.

Vineetha said: (Mar 12, 2016)  
We can easily guess it because, 100 is the only number that is not divisible by 6 in the above series.

Shimaz Javaid said: (Sep 3, 2016)  
Simplest and correct explanation are other than 100 every term is divisible by 6.

Sada said: (Jul 31, 2017)  
Here, 100 is not a multiple of 6.

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