Một hộp có bi đen, bi trắng. Chọn ngẫu nhiên bi. Xác suất bi được chọn cùng màu là:         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  “It's really raining.” “Yes. If the weather ___________, we’ll have to camp somewhere else.”
   

• Choose the best answer for the following sentence:

  “My boss made me work overtime again.” “If I were you, I ___________ my job.”
   

• Choose the best answer for the following sentence:

  “Thank you for your help.” “ ___________ want more information, call again tomorrow.”
  
  

• Choose the best answer for the following sentence:

  “Remember the day I drove you to the airport?”

  “If you hadn’t ___________ me, I would have been late.”
  
  

• Choose the best answer for the following sentence:

  “Sally finally got here from Chicago.” “If she had come earlier, we _________ taken her to the play.”
   

• Choose the best answer for the following sentence:

  “I don’t know whether to take that mathematics course or not.” “If ___________ you, I’d take it.”
   

• Choose the best answer for the following sentence:

  It is ___________ that about 700 deer have been killed in the last few years due to the their horns.
   

• Choose the best answer for the following sentence:

  “My car broke down when I was leaving Detroit and I had to take the bus.'' ___________ '', we would have picked you up.”
   

• Choose the best answer for the following sentence:

  “It’s beginning to rain.” ''___________, we won’t be able to finish the ball game.”
   

• Choose the best answer for the following sentence:

  If I ___________ as young as you are, I _____________ in a boat round the world.