Num of ways to distribute Identical Objects to Different Bins

This video focuses one classical combination problem: "In how many different ways can 7 identical notebooks be distributed among 4 different students so that each student gets at least 1 notebook?" There is the standard star and bar approach to this problem. Here we assume a lower grade audience and consider an approach that uses basic counting. The powerful approach is to simplify the problem to a version that we can solve and generalize it from there.