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Mathematics 21 Online
OpenStudy (anonymous):

If C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and D = {numbers divisible by 3 from 1 to 21}, what is C ∩ D? {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 21} {3, 6, 9, 12, 15, 18, 21} {3, 6, 9} { }

OpenStudy (anonymous):

{3,6,9} i think

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