Mathematics, 06.10.2021 21:40, carnations

Có bao nhiêu cách lấy ra k phần tử trong n phần tử xếp trên đường tròn sao cho không có 2 phần tử kề nhau cùng được lấy ra?

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Có bao nhiêu cách lấy ra k phần tử trong n phần tử xếp trên đường tròn sao cho không có 2 phần tử...