There are 1000 children in a school. For a P.T. drill, they have to stand in such a manner that the number of rows is equal to the number of columns. How many children would be left out of this arrangement?

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Solution

The correct option is B
39

Number of rows = Number columns. This means that the arrangement is a perfect square. The perfect square nearest to 1000 and less than that is 961. This can be estimated by roughly analyzing the square root of 1000 which will be 10 $\sqrt{10}$ . Hence 39 students will be left out of this arrangement.

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