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minhkhue27082001
2 năm trước
Có 10 quả cầu đỏ đc đánh số từ 1 ->10 7 quả cầu xanh đc đánh số từ 1 đến 7 8 quả cầu vàng ..... 1 đến 8 . Hỏi có bao nhiu cách lấy ra 3 quả khác màu và khác số
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