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

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...