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Q.

Which of the following numbers cannot be a perfect square?

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a

476100

b

64000

c

316969

d

12100

answer is D.

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Detailed Solution

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We know that a perfect square can never end with the digits 2, 3, 7, or 8. Also, the number of zeroes at the end of a perfect square is always even.

It can be seen that 64000 has three zeroes at its end.

Thus, the number 64000 cannot be a perfect square.

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