Question: a proof by contradiction. Rank the options below. As IT and 5 are odd, their sum / + 5 should be even, but it is

a proof by contradiction. Rank the options below. As IT and 5 are odd, their sum / + 5 should be even, but it is given to be odd. This is a contradiction. We know that the sum of two odd numbers is even. Suppose that / + 5 is odd and that n is odd. Therefore, our supposition was wrong; hence n is even

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