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Thaonhi2806
2 năm trước
Có 8 bạn đi chơi với nhau biết rằng trong bất cứ nhóm ba người nào của 8 bạn ấy đều có một người quen với hai người kia .Chứng minh rằng có cách xắp xếp sao cho 8 bạn ấy đi trên bốn xe mà mỗi xe đều có 2 người quen nhau. Mình cảm ơn =D
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