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Question

Which of the following is not a perfect square?


A

169

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B

196

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C

144

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D

245

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Solution

The correct option is D

245


We know that, the numbers ending with 2, 3, 7, 8 are not perfect squares.

Here, the numbers end with 9, 6, 4 and 5.

We know that, 169=132196=142144=122

Also, 152=225 and 162=256So, 245 is not a perfect square.

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