What could be the possible one's digit of the square root of the number 1521?

1 or 9

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2 or 4

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4 or 3

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3 or 7

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Solution

The correct option is A 1 or 9
If the number ends with 1, then the ones digit of the square root of that number may be 1 or 9.
Therefore, ones digit of the square root of 1521 is either 1 or 9.

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