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Mathematics, 23.08.2021 14:00 240662

Một đoàn gồm 12 học sinh thi học sinh giỏi trong đó có 7 học sinh nam và 5 học sinh nữ. Chọn ngẫu nhiên 2 học sinh trong đoàn: a. tính xác suất để chọn được 2 học sinh nam
b. tính xác suất để chọn được 2 học sinh nữ

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Một đoàn gồm 12 học sinh thi học sinh giỏi trong đó có 7 học sinh nam và 5 học sinh nữ. Chọn ngẫu nh...
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