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It refers to any two sets denoted by A and B such that every element of A is also an element of B then A is called subset of B, written A⊆B,

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Answer:

The symbol ∪ is employed to denote the union of two sets. Thus, the set A ∪ B—read “A union B” or “the union of A and B”—is defined as the set that consists of all elements belonging to either set A or set B (or both).

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