Aptitude - Odd Man Out and Series - Discussion

Insert the missing number.

3. 

1, 4, 9, 16, 25, 36, 49, (....)

[A]. 54
[B]. 56
[C]. 64
[D]. 81

Answer: Option C

Explanation:

Numbers are 12, 22, 32, 42, 52, 62, 72.

So, the next number is 82 = 64.


Vicky said: (Jul 23, 2011)  
1+0=1
1+3=4
4+5=9
9+7=16
16+9=25
25+11=36
36+13=49
49+15=64

Adil Maqbool said: (Aug 23, 2013)  
To each number successively add odd numbers from 3 onwards & we get 64 as answer.

Sudheer said: (Nov 14, 2014)  
I didn't understand, how it came 64?

Swathi said: (Nov 15, 2014)  
4-1=3
9-4=5
16-9=7
25-16=9
36-25=11
49-36=13
64-49=15

The difference of two preceding number is odd from 3 onwards. Answer is 64

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