Two
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If the set is of finite order, that is, it has a finite number of elements, n, then the number of subsets is 2n.
If a set has "n" elements, then it will have 2n subsets. This number of subsets is always larger than the number of elements - whether the set is finite or infinite.
2n - 1
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.
Two. The set {x} has the subsets {} and {x}.