Problema Solution
Jenny wants to by 5 soundreacks the store carries 9 different soundtracks how many different selections are possible?
Answer provided by our tutors
we will assume the order of the track doesn't matter
we need to find the number of 5-combinations of 9 elements (the number of different subsets of 5 elements from the set of 9 elements):
C(9, 5) = 9!/(5!(9 - 5)!) = 6*7*8*9/24 = 126 different selections possible.