mot doi san xuat co14 nguoi gom 6nam ,8nu trong do co 1 doi vo chong.Nguoi ta chon 1 to cong tac gom 6 nguoi sao cho trong to co 1 to truong ,5 to vien hon nua hai vo chong khong dong thoi co mat trong to.Hoi co bao nhieu cach chon
cứ khi chọn 1 người thj còn lại 12 người để chọn ra 5 người nếu tổ trưởng là chồng hoặc vợ.như vậy sẽ có 12*13 cách cọn. –  nawakakimihirosima 15-10-13 01:09 PM
theo mình là có 2574 cách chọn –  Phạm Anh Tuấn 14-10-13 11:49 PM
bo chong hoac vo ra con 19 nguoi. voi moi cach nay chon 6 trong 19 nguoi dc C 6 cua 19. moi cach nay co 6 cach sap xep vi tri. vay co tat ca 2.6.c6 cua 19. hĩ ko biet cach danh moi vao ae thong cam tu dich nhe

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