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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?
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OpenStudy (anonymous):
pick the same element common in both
OpenStudy (anonymous):
3,6,9
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