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Question

Which one of the following numbers is not a perfect square from 4900,90000,810000,81000?

A
4900
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B
90000
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C
810000
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D
81000
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Solution

The correct option is C 81000
4900=70 perfect square
90000=300 perfect square
810000=900 perfect square
81000 is not an integer
81000 is not a perfect square

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