Instructions

In each of the following questions, select the missing number from the given responses.

Question 180

16 49 64
25 36 81
9 13 ?

Solution

In the first column, $$\sqrt{16}+\sqrt{25}=4+5=9$$

and in the second column, $$\sqrt{49}+\sqrt{36}=7+6=13$$

Similarly, $$\sqrt{64}+\sqrt{81}=8+9=17$$

=> Ans - (B)

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16 49 6425 36 819 13 ?