Problema Solution
If there are 9 class periods in a school day, and a typical student takes 5 classes, how many different time patterns are possible for the student?
Answer provided by our tutors
Since we need to find is the time patter, we are assuming that the order of the classes is not important, thus we have:
C(9, 5) = 9!/(5!(9-5)!)
C(9, 5) = 6*7*8*9/(2*3*4)
C(9, 5) =126
There are 126 different time patterns.