Question: Please help, I'm not sure how to start this proof. (3) Write proofs by contradiction for the following statements. (a) Prove that if n+2 is

Please help, I'm not sure how to start this proof.

Please help, I'm not sure how to start this proof. (3) Write

(3) Write proofs by contradiction for the following statements. (a) Prove that if n+2 is even, then n is even. (b) A grocery store sells three kinds of sandwich rolls. Prove that if you buy four rolls, there must be at least two of some kind

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