Find the indicated intersection or union.{1, 5, 8, 9} ? {2, 4, 7}
A. {1, 5, 8, 9}
B. {2, 4, 7}
C. {1, 2, 4, 5, 7, 8, 9}
D. ?
Answer: D
Mathematics
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A. 
B. 
C. 
D. 
E. 
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