If A, B, C, ..., X, Y, Z represents digits, which of the following could be a perfect square?

XX1

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ABC2

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PQR7

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Can't be said without actual calculation

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Solution

The correct option is A
XX1

The numbers 7, 2 and 3 do not appear in the unit place of any perfect square. So, ABC2 and PQR7 can not be perfect squares and XX1 is the only number which could be a perfect square.

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