{}, {1}, {2} and {1,2}
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5 subsets of 4 and of 1, 10 subsets of 3 and of 2 adds up to 30.
For example, if you take the set A = {1, 2}, then the following sets are all subsets of it: {}, {1}, {2}, {1, 2}. That is, all the sets that fulfill the condition that all of its elements are also elements of the set "A".
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natural numbers integers and whole numbers
A set with 50 elements has 250 subsets.