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

Answers: 2

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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,...