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A_1, A_2, A_3, A_4 are subsets of U (75 elements). Each A_i has 28 elements. Any two intersect in 12 elements. Any three intersect in 5 elements. All four intersect in 1 element. Find the number of elements belonging to none of the four subsets. | Watch the step-by-step video solution for this NIMCET PYQ.