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respected sir,
could you please tell me the diffrence between slack and surplus?Slack is where you have a less than or equal constraint, and at the optimal solution you are using less than the maximum available – the difference is the slack (and this is the usual situation in the exam.
Surplus is where you have a more than or equal constraint, and at the optimal solution you are using more than the minimum – the difference is the surplus (this is not common in the exam).
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