Mathematics, 18.06.2021 05:40 cheesecake1919

trong một hộp đựng 20 viên bi màu đen khác nhau và 19 viên bi mài trắng khác nhau. hỏi có bao nhiêu cách sắp xếp cá viên bi thành hàng ngang mà có màu xen kẽ nhau?

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