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There are 4 items: 1, 2, 3, and 4. If we just allow the following combinations, what should we call them? I forgot it. Is it called nCr?
1 2 3 4 1 2 3 1 2 4 2 3 4 1 2 1 3 1 4 2 3 2 4 3 4 1 2 3 4
That’s the power set. Note that the power set also contains the empty set.