How can I figure out the following questions?
How many possible combinations can be done by having 26 boxes and 15 red rocks, and 15 black rocks? Each box can have up to 15 rocks in it. We can have none or all 15 rocks in one box, or distributed in the boxes. All the rocks do not have to be used. But we can not mix the red and black rocks together. Meaning if one of the boxes has at least 1 black rock in it, we can not add any red rocks to that box. The rocks have no value, other than that they are red or black.