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Mathematics, 13.12.2021 20:10 TH3L0N3W0LF
Một lớp có 20 nam và 10 nữ. Hỏi có bao nhiêu cách chọn 1 ban cán sự lớp
gồm 1 lớp trưởng, 1 lớp phó học tập và 1 lớp phó đời sống.
a) Một cách tùy ý.
b) Lớp trưởng là nữ
c) Có đúng 1 nữ.
d) Có nhiều nhất 1 nữ
![ansver](/tpl/images/cats/User.png)
Answers: 1
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Một lớp có 20 nam và 10 nữ. Hỏi có bao nhiêu cách chọn 1 ban cán sự lớp
gồm 1 lớp trưởng, 1 lớp ph...
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