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Which number is not the perfect square?

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1.44

1.21

0.81

3.6

answer is D.

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Detailed Solution

$H e r e, \sqrt{1.44} = \sqrt{1.2 \times 1.2} = 1.2 A n d, \sqrt{1.21} = \sqrt{1.1 \times 1.1} = 1.1 A n d, \sqrt{0.81} = \sqrt{0.9 \times 0.9} = 0.9$

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