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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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
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