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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)?
How many zeros will there be at the end of 7000^2?
21 and 28 are two consecutive triangular numbers. Their sum is
Using prime factorisation, \sqrt{1764} is
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