Question 363773
P(A)=60/130=6/13
P(B)=90/130=9/13
P(A|B)=20/90=2/9
P(B|A)=20/60=1/3
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I'm don't know what n(A) and n(B) mean. If it means numerical value of A and B then the answers are 60 and 90.
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Ed