If number of jobs is not equal to the number of operators then the assignment problem is known as unbalanced assignment problem. In other words in a pay off matrix of assignment problem if number of rows and number of columns are not equal then it is unbalanced assignment problem.
To solve unbalanced assignment problem it is necessary to insert dummy row or dummy column such that the given pay off matrix become a square matrix. All values in dummy row or column are assume to be zero.
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