Let A and B be subsets of a space X such that A is an open set and B is a closed set. Then a. A-B is open and B-A is closed b. A-B is open and B - A is open c. A-B is closed and B-A is open d. A-B is closed and B-A is closed The formula P(AUB) = P(A) + P(B) holds when a. A and B are uncorrelated b. A and B are independent c. A and B are disjoint d. A and B are correlated.

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