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OpenStudy (anonymous):
If n(A) = 14, n(A ∪ B) = 21, and n(B) = 11, then what is n(A ∩ B)?
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OpenStudy (anonymous):
n(A u B) = n(A) + n(B) - n(A ^ B) , right?
OpenStudy (anonymous):
Glad to have helped.
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