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Prove that 2 divides n2 + n whenever n is a positive integer.
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Prove that 2 divides n2 + n whenever n is a positive integer.

User Hendrik M Halkow
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When ever a variable and a number are side by side(n2, which means n times 2) we do the opposite operation, which in this case is to divide n and 2 which equals n
User Josetta
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