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What is the least number to be added to 1500 to make it a perfect square

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What is the least number to be added to 1500 to make it a perfect square
1. 12
2. 15
3. 21
4. 25
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Correct Answer - Option 3 : 21

Calculation:

The value of 382 < 1500 < 392 

The value = 1444 < 1500 < 1521

The value added = 1521 - 1500 = 21

∴ The least number to be added to 1500 to make it a perfect square is 21.

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