Question

A professor must randomly select 4 students to participate in a mock debate. There are 20 students in his class. In how many different ways can these students be selected, if the order of selection does not matter?

Answer 1

There are 4845 different ways he could chose the students.

Answer 2

The equation we used in this problem is the combination of probability. The formula used is "nCr = n! / r! * (n - r)!" where, n is all 20 students and r is the 4 students. Substituting the numbers we get 4845 ways.