Let X1, X2 and X3 represent binary decision variables, where the subscript indicates the project number. The following equation represents the constraint that project 3 cannot be performed when both project 1 and project 2 are performed: X1 + X2 S 2 (1 - X3) True False Use the following information for the next 4 questions. Petra's Plastics determined the combination of shipping routes to minimize the cost of transporting product from the plants to the customers. The result of her analysis is shown below (with some cells intentionally left blank or hidden). E F G B D Petra's Plastic Company Vancouver Radium Calgary Cost for Shipping a Load of Plastics Customer Edmonton Kelowna Lethbridge $5.00 $7.00 $8.00 $6.00 $6.00 $9.00 $7.00 $5.00 $5.00 1 2 DATA 3 4 5 6 7 Plant 8 9 10 11 12 13 14 15 Plant 16 17 18 19 Total Loads of Plastics Shipped Customer Edmonton Kelowna Lethbridge Shipped Supply 40 40 30 0 40 30 20 50 0 0 Vancouver Radium Calgary Received Capacity 0 0 40 60 20 The Vancouver plant has excess supply at the optimal solution. True False