A Gate question !

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Which number does not belong in the series below ?

2 , 5 , 10 , 17 , 26 , 37 , 50 , 64 2,5,10,17,26,37,50,64


The answer is 64.

Nimesh Nair by Nimesh Nair , 27, India

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3 solutions

Nikhil Bhavsar
Sep 28, 2014

64 is a perfect square

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Rohit Gupta
Jun 20, 2014

the second differences are equal and first differences are in A.P. like: 5-3=2 , 10-5=5 , 17-10=7 , 26-17=9 and so on, like wise , 50+15 = 65 and not 64

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Nimesh Nair
Jun 17, 2014

1^2+1=2 2^2+1=5 3^2+1=10 4^2+1=17 5^2+1=26 6^2+1=37 7^2+1=50 8^2+1=65 But here it is 64..So,64 turns out to be the number that does not belong to the given series..

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