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1.A set is a collection of distinct,symbols on ordered objects .Sets are typically collections of numbers,though a set may contain any type of data (including other sets).The object in a set are called the members of the set or the elements of the set.
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Union of set is when you combine the sets given. ex L{1,2,3,4,5} U M{6,7,8,9,10} = L U M {1,2,3,4,5,6,7,8,9,10}
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