I have the following question: "Prove that if n is an odd integer, then 7n − 5 is even by  (a) a proof by contrapositive and (b) a proof by contradiction." I have the following solution but I'm not quite sure if its right, I know there are some writing style mistakes but is the general way of solving these proofs right?: For (a), If 7n-5 is odd then 'n' is even. 7n-5=2k+1 we need to show that 'n'

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