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What are the two possible units digit of the square root of 9801?

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1 or 9

2 or 8

1 or 8

2 or 9

answer is A.

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Detailed Solution

Given number is 9801.
As we know that all the perfect square number ends with

1, 4, 9, 6, 5, 00

.
Square of 1 end in 1 and square of 9 end in 1.
Thus, the possible unit digit of square root of 9801 is either 1 or 9 and it will be an odd square root.
Therefore, option (1) is correct.

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