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Mathematics, 28.06.2021 14:00 leiort0930

Một lớp có 10 học sinh nam và 15 học sinh nữ. Có bao nhiêu cách chọn ngẫu nhiên 5 học sinh nếu : A, Có nhiều nhất 2 nam trong số được chọn
B, có ít nhất một học sinh nam được chọn
C, Chọn được số nam nhiều hơn số nữ

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Một lớp có 10 học sinh nam và 15 học sinh nữ. Có bao nhiêu cách chọn ngẫu nhiên 5 học sinh nếu : A,...

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