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1.1 Use the direct proof method shown in class to show following proposition: if alb and blc then alc 1.2 Use Proof by Contradiction to

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1.1 Use the direct proof method shown in class to show following proposition: if alb and blc then alc 1.2 Use Proof by Contradiction to show Suppose that n 1 pieces of mail are delivered to n mailboxes. Then some mailbox contains at least two pieces of mail

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