Combinatorial Proofs

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Jihui Jin

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Jul 24, 2012, 5:15:39 PM7/24/12
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How would i go about doing 22 a) from hw 6.4?

Kevin Lin

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Jul 24, 2012, 11:29:55 PM7/24/12
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Here is a hint: Think about the ways of choosing two distinct subsets of {1,2,...,n}.
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