Question: write a proof for those: 1. For all integers a, b , and c , if a divides b then a divides bc . 2.

write a proof for those:

1. For all integers a, b, and c, if a divides b then a divides bc.

2. The sum of any three consecutive integers is divisible by 3. (Two integers are consecutive if, and only if, one is one more than the other.)

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