write the possible ones digit of the square root of wach of the following numbers 6561
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6561 is the perfect square of 81 .
6561 in unit digits-1
Sums of number is -9
So , 81 in unit digits-1
Sums of number-9
6561 in unit digits-1
Sums of number is -9
So , 81 in unit digits-1
Sums of number-9
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