Question: Can someone solve this for me please? 3. (10 pt.) Prove that for any positive integer n, n is even if and only if 7n

Can someone solve this for me please?

Can someone solve this for me please? 3. (10 pt.) Prove that

3. (10 pt.) Prove that for any positive integer n, n is even if and only if 7n 4 is even. Indicate which proof methods you used, as well as the assumptions (what you suppose) and the conclusions (what you need to show) of the proof

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