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

32761

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81225

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20164

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42437

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Solution

The correct options are
C
20164

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 ?

20164

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