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प्रश्न
For the following, find the least number that must be added so that the resulting number is a perfect square 511.
उत्तर
511
Taking square root of 511, we find that 27 has been left We see that 511 is greater than (22)2
| 22 | |
| 2 | 5 11 4 |
| 42 | 111 84 |
| 27 |
On adding the required number to 511, we get (23)2 i.e., 529
So, the required number = 529 – 511 = 18
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