Mathematics, 08.08.2021 06:40 wisal96
Một lớp học có 30 sinh viên trong đó có 20 là nam. Có bao nhiêu cách chọn ra một ban cán sự gồm 4 sinh viên nếu:
1) Có đúng 2 nam
2) Không có nam
3) Nhiều nhất 2 nam
4) Có ít nhất 1 nam.
Answers: 1
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Một lớp học có 30 sinh viên trong đó có 20 là nam. Có bao nhiêu cách chọn ra một ban cán sự gồm 4 si...
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