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OpenStudy (anonymous):
If n(A) = 28, n(B) = 41, and n(U) = 58, find the number of elements in region I.
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OpenStudy (amistre64):
what defines region I ?
OpenStudy (amistre64):
n(X) just indicates the number of elements in a set U tends to mean universal, so if you subtract A and B from U, and depending on how region I is defined; that should get you to a good place
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