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Sets
A set is a collection of elements or numbers or objects, represented within the curly brackets { }.
For example: {1,2,3,4} is a set of numbers.
There are three forms in which we can represent the sets. They are:
Statement form: A set of even number less than 20
Roster form: A = {2,4,6,8,10,12,14,16,18}
Set builder form: A = {x: x=2n, n ∈ N and 1 ≤ n ≤ 20}
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