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Question: What is an Intersection of two Sets ?

Answer:

The intersection of two sets is the set of elements which are in both of the sets.

For example, suppose,
A = {multiples of 2 less than 14} = {2,4,6,8,10,12}
B = {multiples of 3 less than 15} = {3,6,9,12}

The intersection of A and B, written A ∩ B, is {6,12}. In mathematics, the intersection of two sets A and B is the set that contains all elements of A that also belong to B (or equivalently, all elements of B that also belong to A), but no other elements.