1) Find the union of three sets AUBUC, given A= {1, 2, 3, 4), B= {3, 4, 5, 6} and C= {6, 7,8,9}. 2) Find the intersection of three sets AnBnC, given A= {24, 25, 26, 27, 28), B= {20, 22, 24, 26, 28} and C= {26, 27, 28, 29).

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