SOLUTION: Find P(A|Ac) [c being the complement] A. 1 B. 0 C. 1/2 D. unknown If event A is a proper subset of event B, find P(A|B). A. P(A) B. 1 C. 0 D. P(A)/ P(B) please

Question 763089: Find P(A|Ac) [c being the complement]
A. 1
B. 0
C. 1/2
D. unknown

If event A is a proper subset of event B, find P(A|B).
A. P(A)
B. 1
C. 0
D. P(A)/ P(B)

please help, I'm so confused especially on the first one thanks
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
P(A|Ac) means find the probability of event A happening given that Ac has happened

The two events are complementary events, so both cannot happen at the same time.

This means that P(A|Ac) = 0

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P(A|B) = P(A)/P(B) since A is a proper subset of B
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