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Which of the following numbers is surely not a perfect square?
What is the unit digit of 267^2?
How many natural numbers lie between 24^2 and 25^2 (not counting these two squares)?
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21 and 28 are two consecutive triangular numbers. Their sum is
If the square of a number ends in 6, the unit digit of the number must be
Which one of the following is a perfect square?
