Question: Let A denote the event that the next request for assistance from a statistical software consultant relates to the SPSS package, and let B be

Let A denote the event that the next request for assistance from a statistical software consultant relates to the SPSS package, and let B be the event that the next request is for help with SAS. Suppose that P(A) = .30 and P(B) = .50.
a. Why is it not the case that P(A) + P(B) = 1?
b. Calculate P(Aʹ).
c. Calculate P(A ⋃ B).
d. Calculate P(Aʹ ∩ Bʹ).

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