Answer :
[tex] n^2-n=n(n-1) [/tex]
[tex] n(n-1) [/tex] is a product of two consecutive numbers, one of which, must be even. Therefore the number is divisible by 2.
[tex] n^2-n=n(n-1) [/tex]
[tex] n(n-1) [/tex] is a product of two consecutive numbers, one of which, must be even. Therefore the number is divisible by 2.