inclusion/exclusion question

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$Old$ November 3rd, 2009, 09:31 PM

sbankica $sbankica is offline$

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$Default$ inclusion/exclusion question

peter hates to be alone, so every night he invites 3 of his 8 friends over. At the end of one week he had invited each of his 8 friends over at least once. How many ways can he have done this?

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combinatorics, discrete, discrete math, exclusion, inclusion

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