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

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30976

75625

28561

143642

answer is D.

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Detailed Solution

Given numbers are,

30976

75625

28561

and

143642

.
As we know that all the perfect square number ends with

1, 4, 9, 6, 5, 0

.
So, the square of a natural number never ends in

2

∴ 143642

is not the square of a natural number.
Therefore, option (4) is correct.

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