Có học sinh giỏi gồm học sinh khối , học sinh khối và   học sinh khối . Hỏi có bao nhiêu cách chọn ra học sinh sao cho mỗi khối có ít nhất học sinh?  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• 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:

  The number of students attending English courses at our university are increasing.         

• 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:

  A number of the American Indian languages spoken at the time of the European arrival in the New World in the late fifteen century have become extinct.         

• 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:

   A food additive is any chemical that food manufacturers intentional add to their products.

• 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:

  A smile can be observed, described, and reliably identify, it can also be elicited and manipulated under experimental conditions.  

• 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:

  We didn’t have many knowledge about physics.         

• Choose A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Proteins are made up of folded irregularly chains, the links of which are amino acids.         

• Choose A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Although most species of small birds gather in groups at feeders provided by bird - watchers, the bright red cardinals usually appears alone or with its mate.    

• Choose A, B, C or D to indicate the underlined part that needs correction in each of the following questions:

  Henry David Thoreau was an American writer who is remembered for his faith in religious significance of the nature.              

• 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:

  Amelia Earhart, the first woman to fly solo across the Atlantic, disappeared on June 1937 while attempting to fly around the world.         

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

  They asked me how long did it take to get to Paris by train.