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A= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
B= { 2, 3, 5, 7, 11, 13}
AnB= {2, 3, 5, 7} n(AnB)= 4
BnA= {2, 3, 5, 7} n(BnA)= 4