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Question 2 (vi)
The following number is obviously not a perfect square. Give reasons. 

89722


Solution

The square of any number generally has one of these digits 0, 1, 4,  5, 6 or 9 at its unit place.
Also, a number which is a perfect square may have even number of zeroes at its end.

89722 have its unit place digit as 2. Therefore, it cannot be a perfect square.


Mathematics
NCERT Textbook
Standard VIII

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