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thuthuthao1711
2 năm trước
Lớp 11A có 32 học sinh chia vào 16 bàn (mỗi bàn 2 học sinh) . Trong lớp có 2 bạn A B k muón ngồi cạnh nhau, gvcn sắp chỗ ngẫu nhiên thì xác suất 2 bạn A b k ngồi cạnh nhau là?
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