Which one of the following cannot be the square of a natural number?

32761

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81225

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20162

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42437

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Solution

The correct option is D
42437

We know that the square of a natural number can never end in 2, 3, 7 or 8.
Hence, 20162 and 42437 cannot be squares of natural numbers.

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Which one of the following can't be the square of a natural number ?

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