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If r and s are integers and rs + r is odd, which of the following must be even ?
If r is factored out to rewrite this as r (s + 1), we can see it as a product of two parts, r and s + 1. For their product to be odd, r must be odd and s + 1 must be odd. We also know that even + odd = odd. For s+1 to be odd, s must be even since 1 is odd. A. R B. s C. r + s D. rs - r E. r^2 + s _________________
Re: If r and s are integers and rs + r is odd, which of the following must [#permalink]
30 Jul 2016, 00:56
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