# Q.9  There are 500 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 number of columns. How many children would be left out in this arrangement.

Given that the number of rows is equal to the number of columns.    i.e., in the form of

So the number of students that can stand in this order will be the perfect square number just less than 500.

We know that                    and

So the number of students that would be left out in this arrangement = 500 - 484 = 16 students.

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