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Find A U B U C. A){2,3,5,6,7,8,9,11,12}B){2,3,5,6,7,8,9}C){2,3,5,7,8,9,12}D){3,5,6,7,8,11,12}

User Hijiangtao
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Answer: {2,3,5,6,7,8,9,11,12}

User Lukaszrys
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