def choices(n, k):
if k == 1:
return n
if n == k:
return 1
if k == 0:
return 1
return choices(n - 1, k) + choices(n - 1, k - 1)
comb = choices(n, k)
print comb
print ("Total number of ways of choosing %d out of %d courses: " % (n, k))
n = int(input("Number of courses you like: "))
k = int(input("Number of courses you can register for: "))
Still isn't working though..
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