A professor must randomly select 4 students to participate in a mock debate. There are 18 students in his class. In how many different ways can these students be selected, if the order of selection does not matter?

A. 3,060
B. 38,390
C. 73,440
D. 1,768

Question

A professor must randomly select 4 students to participate in a mock debate. There are 18 students in his class. In how many different ways can these students be selected, if the order of selection does not matter?

 		A.	3,060
 		B.	38,390
 		C.	73,440
 		D.	1,768

anonymous · Answer

$$18\times17\times16\times15\div24$$