The elements of a set are written and separated by commas. For example, set A containing the five vowels of the English alphabets is written as A = {a, e, i, o, u}. Set notation help in conducting various operations across sets. The operations of union (U), intersection (∩) or difference(-), across two or more sets are denoted by the various set notations, using symbols.
A Union of sets can be written like this.
The union between A = {a, b, c, d} and B = {c, d, e} is noted as A U B = { a, b, c, d, e}.
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