Which of the following is/are perfect square(s) ?

125

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169

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900

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Solution

The correct options are
B 169
C 81
D 900
$169 = 13^{2}$
$81 = 9^{2}$
$900 = 30^{2}$
$125 = 5^{3}$
$∴$
169, 81 and 900 are perfect square.
125 is not a perfect square.

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