Mathematics, 15.06.2021 07:10 annamcveigh50

Trong một thùng có chứa 3 bi đỏ, 4 bi đen. Lấy ngẫu nhiên từng viên cho đến khi lấy được bi đỏ thì dừng. Gọi X là số viên bi cần lấy. Tìm quy luật ppxs cho X.

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Trong một thùng có chứa 3 bi đỏ, 4 bi đen. Lấy ngẫu nhiên từng viên cho đến khi lấy được bi đỏ thì d...

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