Có bao nhiêu số tự nhiên có tám chữ số trong đó có ba chữ số , không có hai chữ số nào đứng cạnh nhau và các chữ số khác chỉ xuất hiện nhiều nhất một lần.  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose one sentence that has the same meaning as the root one:

  I’m not sure whether Julia will be there or not.
  
  

• Choose one sentence that has the same meaning as the root one:

  Don’t be so rude to people!
  
  

• Choose one sentence that has the same meaning as the root one:

  Don’t bother to lock the door.
  
  

• Choose one sentence that has the same meaning as the root one:

  I’m afraid I won’t be able to do the work in time.
  
  

• Choose one sentence that has the same meaning as the root one:

  It’s very important to keep your passport in a safe place.
  
  

• Choose one sentence that has the same meaning as the root one:

  The police shouldn’t allow people to park there.
  
  

• Choose one sentence that has the same meaning as the root one:

  Visitors must leave umbrellas and sticks in the cloakroom.
  
  

• Choose one sentence that has the same meaning as the root one:

  He can’t have used a calculator to do it.
  
  

• Choose one sentence that has the same meaning as the root one:

  My grandfather’s health is improving.
  
  

• Choose one sentence that has the same meaning as the root one:

  Nowadays many people are learning English.