If P(A/B)=1/4 and P(A∩B) =1/5 then P(B) is ________________?
Correct answer: A. 4/5
- A. 4/5
- B. 1/20
- C. 0
- D. 1/9
Explanation
Using P(A|B)=P(A∩B)/P(B), we get 1/4=(1/5)/P(B). Rearranging gives P(B)=4/5.
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