The problem goes like: A store sells 11 different flavors of ice cream. In how many ways can a customer choose 6 ice cream cones, not necessarily of different flavors?
I tried thinking for 2 days then I gave up and seen solution. The answer was somewhat connected to Stars and bars problem. The question is how can this problem be connected to Stars and bars puzzle? I am not able to see any connection of this puzzle to the problem. For eg: Stars and bars puzzle requires identical object to be distributed in boxes which is not case here.