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!

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- Mar 30th 2009, 12:49 PMGAdamsprove 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! - Mar 30th 2009, 01:56 PMTwig
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