Find the indicated set.Let A = {2, 7, 9, 12, 15}, B = {3, 9, 15, 20}, and C = {4, 9, 12, 15}.Find 

A. {2, 3, 4, 7, 9, 12, 15, 20}
B. {2, 7, 9, 12, 15, 3, 9, 15, 20, 4, 9, 12, 15}
C. {9, 15}
D. {9, 12, 15}


Answer: A

Mathematics

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