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I don't really understand this concept and I need help figuring out how to create a proof for this. please help! CMSC 203 Homework 3

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I don't really understand this concept and I need help figuring out how to create a proof for this.

please help!

CMSC 203 Homework 3 1. Prove the following: Va e N, WO EN, Vc E N, if ab and b/c then ac 2. Prove the following: In EN, If n is odd, then nis odd

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