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Which of these numbers, if placed in the unit's place, will may be a perfect square?

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answer is B.

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Detailed Solution

If a number has 0, 1, 4, 5, 6 or 9 in the unit’s place, then it may or may not be a square number.

For example, 400 is a perfect square of 20. But 300 is not a perfect square.

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