The constraint (x1 + x2 + x3 + x4 = 2) means that ________ out of the

Question:

The constraint (x1 + x2 + x3 + x4 = 2) means that ________ out of the ________ projects must be selected. Assume that we are using 0-1 integer programming model to solve a problem and xj = 1 if project j is selected and xj = 0, otherwise.
Capital Budgeting
Capital budgeting is a practice or method of analyzing investment decisions in capital expenditure, which is incurred at a point of time but benefits are yielded in future usually after one year or more, and incurred to obtain or improve the...