Update combinations with repetitions

Author: amruthamanoj

combinations with repetitions

@@ -8,6 +8,7 @@ once, is called a combination of n objects taken r at a time with repetition.
 # ans : (r+k -1)C(r) 
 
 
+
 q = []
 a = np.arange(1,9) #types of doughnuts = k = 8
 l = a.tolist()
@@ -23,7 +24,7 @@ b = b.tolist()
 c = l + b  #join both the lists 
 
 
-c+d #--> this is a multiset, where since 12>8, 19-8 = 11 elements are 
+c+d #--> this is a multiset, where since 12>8, here len(c+d) = r=k-1 = 19, since in the end we need to calculate 19C12 
 
 #duplicates of any of the 8 available
 p = list(combinations(c+d,r)) #diff 1 dozen combos of 8 doughnut varieties