If A and B are two events such that P (A) = 3/4, P (B) = 1/4 and P (A n B) = 3/8,
find P (not A and not B).  Choose the correct answer.
A) A)3/7
B) B)3/8
C) C)3/9
D) D)3/10
E) E)3/11
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 + 1/4 - 3/8)   P(not A and not B) = 1 - (5/8)   P(not A and not B) = 3/8.   3/8
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If A and B are two events such that P (A) = 3/4, P (B) = 1/4 and P (A n B) = 3/8,
find P (not A and not B).