The +() method is utilized to create a new set with an additional element unless the element is already present.
Method Definition: def +(elem: A): Set[A]
Return Type: It returns a new set with an additional element unless the element is already present.
Set(5, 1, 6, 2, 7, 3, 4)
Set(1, 41, 12, 72, 43, 23, 100)
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