I must organize four monthly dinners (June, July, August, September) of four tables for four guests (course: host, salad, vegetable, and dessert) where no one eats together more than once and no one has to host more than once. This is a table rotation problem that MUST have a formula to easily figure out the seating. I just can't seem to get it. I don't know whether this is array math or matrix math...HELP!! Again the problem is to find the formula to easily plot out which table a person will sit for each monthly meal and which course he will bring - all without having any duplications or overlaps.