Mathematics, 08.09.2021 14:00 shaheedbrown06

Có 4 nữ và 5 nam. Hỏi có bao nhiêu cách lập một tổ gồm 3 người nam nữ tùy ý

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Có 4 nữ và 5 nam. Hỏi có bao nhiêu cách lập một tổ gồm 3 người nam nữ tùy ý...