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please showcase two posts from Kenneth Rosen's Discrete Mathematics? 

hello. i bookmarked https://math.codidact.com/posts/296017,  https://math.codidact.com/posts/296018,
as i am using the same textbook by kenneth rosen, with title discrete mathematics. i had difficulties with these same pages as inquired about in the post.

but why can't i see these posts any more? can someone kindly copy paste the answers here? thanks.