Question
A man has 20 acquaintances of which 12 are relatives. In how many ways out of them he may invite 13 guests so that 9 of them would be relatives and one his best friend?
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The remaining 7 are other friends. Show more…
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A person has got 15 acquaintances of whom 10 are relatives. In how many ways, may he invite 9 guests so that 7 of them would be relatives?
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