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There are no subsets of irrational numbers. There are subsets of rational numbers, however.
Elements can belong to subsets. Subsets can be elements of sets that are called "power sets".
5 subsets of 4 and of 1, 10 subsets of 3 and of 2 adds up to 30.
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