Question 424558
Consider the Venn diagram below. The numbers in the regions of the circle indicate the number of items that belong to that region. Since the diagram wont copy, the left circle "A" contains a "50", the right circle "B" contains a "30" and the center, shared space contains a "80". 
Determine 
n(A) = 50+80 = 130 
n(B) = 30+80 = 110 
P(A) = 130/160
P(B) = 110/160
P(A|B)= 80/110 
P(B|A)= 80/130
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Cheers,
Stan H.