## Question

###### [2Opts] Prove each of the following: (a) If alb and a/c; then af(b _ c) (6) a =b (mod m) ^ c= d (mod m) = a+c=b+d (mod m)

[2Opts] Prove each of the following: (a) If alb and a/c; then af(b _ c) (6) a =b (mod m) ^ c= d (mod m) = a+c=b+d (mod m)

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