18. In order for a linear programming problem to have a unique solution, the solution must exist: a) At the intersection of the non-negativity constraints b) At the intersection of a non-negativity constraint and a resource constraint c) At the intersection of the objective function and a constraint d) At the intersection of two or more constraints e) None of the above 19. A learning curve describes a) The increase in number of units produced per unit time as the total number of units produced increases b) The rate at which an organisation acquires new information c) The increase in production time as the total number of units produced increases d) The amount of production time per unit as the total number of units produced increases 20. When calculating expected values we are: a) looking at the most likely result that is going to occur b) looking at the average result likely to occur c) looking at the best result that can be expected d) looking at the worst result that can be expected