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!
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We do not know what is in set A.
Let's say the set S has n elements. An element can be either in the subset or not in the subset. So There are two ways for one element. Therefore the number of subsets of a set of n elements is 2 multiplied n times which is 2^n
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.
If the set has n elements then it has 2n subsets.