Write a proof below for the following statement. Let n be an integer. Show that if...

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Write a proof below for the following statement. Let n be an integer. Show that if n is a multiple of 3, then n must also be a multiple of 3. (Hint: One of the best methods is to make a proof by contrapositive.) Write a proof below for the following statement. Let n be an integer. Show that if n is a multiple of 3, then n must also be a multiple of 3. (Hint: One of the best methods is to make a proof by contrapositive.)