Question 144

If 5416 x 6 is a perfect square, then the digit at ‘x’ is:

Solution

A perfect square ending with '6' can only have an odd digit at its ten's place, i.e. second last digit. Thus second and last options are eliminated.

Now, $$\sqrt{541656}<736$$

and $$\sqrt{541696}=736$$

=> Ans - (A)

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