We do not know what is in set A.
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Two. The set {x} has the subsets {} and {x}.
The number 8 is not a set and so cannot have any subsets. The set consisting of the number 8 is a set and, since it has only one element in it, it has two subsets: itself and the null set.
2n - 1
That means, figure out how many different subsets a set has. In general, if a set has n elements, it has 2n different subsets.
512 subsets