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What is universal set? what is the examples of universal sets
Universal set is the set of all elements under consideration, denoted by capital U or sometimes capital E.
 The universal set contains all possible numbers that work with the function. Normally, the universal set is the set of real numbers. 
The Universal set of A where A = {x : x is a factor of 15}is
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 3, 14, 15 }


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