Từ một tổ gồm 7 học sinh nữ và 5 học sinh nam. Hỏi có bao nhiêu cách chọn:
a) 6 học sinh
b) 6...
![Mathematics](/tpl/images/cats/mat.png)
Mathematics, 23.07.2021 05:00, wwwcarolynzouowficz
Từ một tổ gồm 7 học sinh nữ và 5 học sinh nam. Hỏi có bao nhiêu cách chọn:
a) 6 học sinh
b) 6 học sinh trong đó có ít nhất 1 học sinh nữ
c) học sinh trong đó số học sinh nữ phải nhỏ hơn 4
d) 6 học sinh trong đó số học sinh nữ không nhỏ hơn 2
![answer](/tpl/images/cats/otvet.png)
Answers: 1
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