Question: 4. Prove that if x and y are both multiples of 3 , then (x1)(y1)1 is also a multiple of 3 . Hint: A multiple

4. Prove that if x and y are both multiples of 3 , then (x1)(y1)1 is also a multiple of 3 . Hint: A multiple of 3 can be written as 3k, for some integer k

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