Let U = {5, 10, 15, 20, 25, 30, 35, 40} A = {5, 10, 15, 20} B = {25, 30, 35, 40} C = {10, 20, 30, 40}. Find A ⋂ C.

A∩C is a set all elements of which are present in A and present in C. For example, if P={1,2,3,4,5} and Q={1,3,5}, then P∩Q={1,3,5} since 1, 3 and 5 are elements of both P and Q. In the question posted, A∩C should have two elements.

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