Mathematics, 26.09.2021 22:30 josecito

Có 3 khối câu hỏi theo kiến thức: khối I gồm 5 câu dễ, 3 câu khó; khối II gồm 4 câu dễ, 2 câu khó; khối III gồm 5 câu dễ, 2 câu khó. Người ta chọn mỗi khối ra 2 câu hỏi để lập thành đề thi 6 câu. Tính xác suất đề thi có nhiều nhất 1 câu khó.

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Có 3 khối câu hỏi theo kiến thức: khối I gồm 5 câu dễ, 3 câu khó; khối II gồm 4 câu dễ, 2 câu khó; k...