Question: Consider a modification of the original Red Brand problem where there are N plants, M warehouses, and L customers. Assume that the only allowable arcs are from plants to warehouses and from warehouses to customers. If all such arcs are allowable-all plants can ship to all warehouses and all warehouses can ship to all customers-how many changing cells are in the spreadsheet model? Keeping in mind that Excel's Solver can handle at most 200 changing cells, provide some combinations of N, M, and L that barely stay within Solver's limit.