How to find combination of 65 objects with 2 "states" for each object?

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I have a problem in which I need to find the combination involving three tables or whether or not the table has a student working in it or not. If I am not mistaken, order doesn't matter, therefore I just listed out all combinations and found 8 combinations. However, this would take too much time for I need to do the same with 65 tables for ex.

Is there a formula to calculate the combination?