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OpenStudy (anonymous):
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OpenStudy (anonymous):
n(A ∩ B)=n(A)+n(B)-n(A U B) n(A U B) = n(A) + n(B) - n(A ∩ B) true or false?
OpenStudy (anonymous):
true right?
OpenStudy (anonymous):
Yes
OpenStudy (anonymous):
Just draw a picture.
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