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A set is an unordered collection of distinct objects, called elements or members of the set. A set is said to contain its elements. We write $a\in A$ to denote that $a$ is an element of the set $A.$

The notation $a ∉ A$ denotes that $a$ is not an element of the set $A.$

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Question ID: mtid-5-stid-8-sqid-1498-qpid-1236