Square root of the greatest $4$ digit perfect square is______.

91

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81

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99

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31

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Solution

The correct option is C $99$
$9801 = 99^{2}$
So $99$ is the square root of greatest $4$ digit perfect square.
Therefore, C is the correct answer.

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Column I	Column II
Greatest 3 digit perfect square	$1, 024$
Smallest 5 digit perfect square	$9, 801$
Smallest 3 digit perfect square	$961$
Greatest 4 digit perfect square	$10, 000$
Smallest 4 digit perfect square	$100$

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