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Use the pigeonhole principle to solve please: will upvote! Let S be a k-element subset of {1,,n}. Prove that, if k > n/2 , then

Use the pigeonhole principle to solve please: will upvote!

Let S be a k-element subset of {1,,n}. Prove that, if k > n/2, then there exists x,yS such that x y = 1.

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