optimization - scheduling problem- using excel solver with binary constraint -

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I am using a solver in Excel to solve a linear optimization problem. I want the solution (the number excel will count) to be binary I set the binary as an obstacle in the sovler and also set the barrier with equal or equal to 1 or 0, but the program does not solve Will! Numbers end, like .99 ..., .83 ..., etc. idea?

Even if you can get it with a spreadsheet software like Excel I do not recommend it. Spreadsheets software has poor numerical accuracy, see.

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