How many ways can you distribute 4 identical balls among 4 identical boxes?
Since the balls are the same and the boxes are the same, the problem is basically how many ways can you get a sum of 4.
I get 5 ways.
Four(4) Identical balls and Four(4) identical boxes mean that the balls are indistinguishable and the boxes are also indistinguishable...
Since there is no restriction, let's try number separation.
Five(5) ways are possilbe.