Question

48. Choose the number which is different from others in the group :
(A) 25 (B) 36 (C) 64 (D) 78

(Imdad Uddin Mazumder )

Answer 1

The odd one out is 78

Solution:

Given, group of numbers is 25 36 64 and 78  

We have to choose the number which is different from the others.

Now , if we observe the numbers in the group.

Every number can be written in square forms except 78.

$\begin{array}{l}{25 \rightarrow 5^{2}} \\\\ {36 \rightarrow 6^{2}} \\\\ {64 \rightarrow 8^{2}}\end{array}$

78 can’t be written . Since it is not a perfect square

So, 25, 36 and 64 are perfect squares but 78 cannot be written in square terms

Hence, 78 is the number which is different from others

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