Question: A restaurant has five entrees, seven main courses, and ten desserts. In how many ways can you select two dishes on the condition that they must not both be from the same part of the menu?
The answer is 155.
I have no idea what qualifies as a dish. Is it the combination of an entree, main course, and dessert? or is it only selecting 2 options from the 3 given e.g. (entree and main course, or, main course and dessert)?