Mathematics, 15.06.2021 04:40 liyahheadhigh

Có bao nhiêu cách chọn ra 3 học sinh từ một lớp có 20 học sinh trong đó có một bạn làm lớp trưởng một bạn lớp phó mot ban la thủ quỷ

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Có bao nhiêu cách chọn ra 3 học sinh từ một lớp có 20 học sinh trong đó có một bạn làm lớp trưởng mộ...

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