Elements can belong to subsets.
Subsets can be elements of sets that are called "power sets".
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A finite set, with n elements has 2n subsets, including the empty set and itself. For infinite sets the number of subsets is the same order of infinity.
512 subsets
A set with 50 elements has 250 subsets.
7.
Well, honey, a set with "n" elements has 2 to the power of "n" subsets. So, if you've got a set with 5 elements, you're looking at 2 to the power of 5, which is 32 subsets. Math doesn't have to be boring, darling!