Có học sinh lớp, học sinh lớp được xếp ngẫu nhiên thành hàng ngang. Tính xác suất để không có hai học sinh bất kì nào của lớp đứng cạnh nhau.  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Cho hỗn hợp Al, Fe vào dung dịch chứa AgNO3 và Cu(NO3)2 được dung dịch X và chất rắn Y gồm 3 kim loại. Chất rắn Y gồm  

• Mark the letter A, B, C or D to indicate the sentence that best combines each pair of sentences in the following questions:

  Marie graduated with a good degree. She joined the ranks of the unemployed.           

• Mark the letter A, Β, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  Companies spend millions of dollars of advertising. They want to increase their sales.           

• Hòa tan hết m gam kim loại M cần dùng 136 gam dung dịch HNO3 31,5%. Sau khi kết thúc phản ứng thu được dung dịch X và 0,12 mol khí NO duy nhất. Cô cạn dung dịch X thu được (2,5m + 8,49) gam muối khan. Kim loại M là:             

• Mark the letter A, Β, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  I had two job offers upon graduation. Neither of them was appropriate for my qualifications.  

• Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in  the following questions:

  The soccer team knew they lost the match. They soon started to blame each other.         

• Mark the letter A, Β, C or D to indicate the sentence that best combines each pair of sentences in the following questions:

  He didn't take his father’s advice. That's why he is out of work.  

• Mark the letter A, Β, C or D to indicate the sentence that best combines each pair of sentences in the following questions:

  We spend about one-third of our lives sleeping. We know relatively little about sleep.           

• Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:

  Anna jogs every morning. It is very good for her health.           

• Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions:

  Had I been interested in that subject, I would try to learn more about it.