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RRB ALP 10th Aug 2018 shift-1 Question 68

Question 68

Which of the following numbers is a perfect square?

Solution

A perfect square number is an integer that is a square of another integer .

if we factorize above numbers , we get

$$441 = 21\times 21.$$

$$192 =4\times 4\times 4\times 3.$$

$$333 = 3\times 3\times 37.$$

and $$327 = 3\times 109.$$

So, only 441 is a perfect square of 21.

Option A is correct choice.



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