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Question

what are the total number of non empty subsets of {1,2,3,4,} and what are they?

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Solution

Non empty subsets of {1,2,3,4} are {1},{2},{3},{4},{1,2},{1,3),{1,4},{2,3},{2,4},{3,4},{1,2,3},{1,3,4},{2,3,4},{1,2,4},{1,2,3,4}
Therefore total number of subsets are 15

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