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  • Brainly User
2014-10-11T17:07:54+05:30
1681 is a perfect square with four digits and its root is 41.

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2014-10-11T17:54:30+05:30

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Square of 100 gives 100 00  the first give digits..

so square 80 or 90  can give a perfect square in 4 digits.
              90² = 8100

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