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Sqrt(p) Is Irrational, Where p Is Prime

Which one of ...

Question

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

A

32761

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B

81225

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C

20164

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D

42437

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Solution

The correct option is D
42437

We know that the square of a natural number never ends in 2, 3, 7 and 8.

$∴$ 42437 can't be the square of a natural number.

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