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Ali had $6y. After he bought some pens at $2 each, he had $y left. How many pens were did he buy?

By Anna

Ali had $6y. After he bought some pens at $2 each, he had $y left. How many pens were did he buy?

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Anna

How many integers x are there such that x(x + 1) * (x + 7) * (x + 8) is a positive integer and a
perfect square?

D

If median and mean of some data is 25 then mode of that data is ___..​

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