Question

find the greatest number of four digits which is a perfect square

Answer 1

Solution :

Greatest number of four digits =9999=9999

Let us find the square root of 99999999

This shows that 992992 is less than 99999999 by 198198

So, the least number to be subtracted is 198198

Hence , the required number is (9999−198)(9999−198)

=9801


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