Aptitude - Odd Man Out and Series - Discussion

Find the odd man out.

7. 

1, 4, 9, 16, 20, 36, 49

[A]. 1
[B]. 9
[C]. 20
[D]. 49

Answer: Option C

Explanation:

The pattern is 12, 22, 32, 42, 52, 62, 72. But, instead of 52, it is 20 which to be turned out.

Sonutalwani said: (Jun 28, 2012)  
1*1=1.
2*2=4.
3*3=9.
4*4=16.
6*6=36.
7*7=49.

20 is not a square of any number.

Prashant Kamble said: (Aug 5, 2013)  
all numbers are perfect square except 20.

Salman Baig said: (Dec 15, 2015)  
Another way to solve this:

1, 4, 9, 16, 20, 36, 49.

O, E, O, E, E, E, O.

There should be some odd no in series instead 20 which is even no.

Saylee said: (Sep 7, 2016)  
All are square numbers expect 20.

Ligesh Kp said: (Nov 2, 2016)  
As per my logic,

1 + 3 = 4
4 + 5 = 9
9 + 7 = 16
16 + 9 = 25
25 + 11 = 36
36 + 13 = 49

So 25 is missing here.

Subhadeep Maji said: (Jan 29, 2018)  
1^2, 2^2, 3^2, 4^2, 5^2, 6^2, 7^2.

As per the question
20 is not a perfect square whereas C is the correct answer.

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