Question

Prove that n^2-n is even for every positive integer n.

Answer 1

if n is odd number and and then if we square it then will get odd number and after that of we subtract n means odd number then will get even number.
similarly if n is even number and and then if we square it then will get even number and after that of we subtract n means even number then will get even number.
so n^2-n is even for every positive integer n.
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