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duongleplk
2 năm trước
Một nhóm học sinh gồm 4 nam và 5 học sinh nữ . Hỏi có bao nhiêu cách sắp xếp 9 học sinh thành hàng dọc sao cho nam nữ đứng xen kẽ giúp em vs ạ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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