A set of which all the elements are contained in another set. The set of even numbers is a subset of the set of integers.
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A set "A" is said to be a subset of "B" if every element of "A" is also an element of "B".
Subsets is one type of an sets
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!
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".
The same way as now (minus the calculators.) The problems were the same, adding, subtracting, division, multiplication, exponets, subsets, etc.