1. ## prove consecutive multiples

Proove that the product of two consecutive multiples of 5 is always an even number

I got:

(5n) (5n + 5)

25n^2 + 25n

n(25n+25)

-can't see it!

2. If n is odd then you have odd * (odd + odd) that is, odd* even = even

If n is even, then even*(even + odd) = even * odd = even