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Mathematics, 02.08.2021 04:30 vaehcollier
1. Trong một hộp chứa sáu quả cầu trắng được đánh số từ 1 đến 6 và ba quả cầu đen được đánh số
7,8,9. Số cách chọn một trong các quả cầu ấy là
A. 6. B. 9. C. 3. D. 1
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1. Trong một hộp chứa sáu quả cầu trắng được đánh số từ 1 đến 6 và ba quả cầu đen được đánh số
7,8,...
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