If A and B are two events such that P (A) = 3/4, P (B) = 1/2 and P (A n B) = 3/8,
find P (not A and not B).
Options:  A) 1/9  B) 1/8  C) 1/11  D) 1/13  E) 2/5
P(not A and not B) = 1 - (P(A) + P(B) - P(AB))   which you might find somewhere in your text.   Substituting in our probabilities we get:   P(not A and not B) = 1 - (3/4 + 1/2 - 3/8)   P(not A and not B) = 1 - (7/8)   P(not A and not B) = 1/8.   1/8
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If A and B are two events such that P (A) = 3/4, P (B) = 1/2 and P (A n B) = 3/8,
find P (not A and not B).