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Which of the following is not a perfect square?

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Which of the following is not a perfect square? 
1. 18
2. 81
3. 121
4. 100
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Correct Answer - Option 1 : 18

Calculation:

18 = 2 × 9

81 = 9 × 9

121 = 11 × 11

100 = 10 × 10

Except 18, all other numbers have a perfect pair of factors

∴ The number which is not a perfect square is 18

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