设A ={1,3,5,7},B = {5, 7, 9,11},则A∪B是()

{1,3, 5}


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 {1,3,5,7}


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{1, 3, 5, 7,9}


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 {1, 3, 5, 7,9, 11}


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设A ={1,3,5,7},B = {5, 7, 9,11},则A∪B是()