question_answer

A class prefect goes to meet the principal every week. His class has 30 people besides him. If he has to take groups of three every time he goes to the principal, in how many weeks will he be able to go to the principal without repeating the group of same three which accompanies him?

A)  \[{}^{30}{{P}_{3}}\]              

B)  \[{}^{30}{{C}_{3}}\]

C)  \[30!/3\]             

D)  None of these