Question 1175798
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Hi
As to 'passing' the exam:
Question States:
 (.30)(.60) + (.70)(.20) = .18 + .14 = .32 passed the exam

 P(A|B) = P(A and B)/P(B) 
P(took the review | passed) =  P(R and Passed)/P(Passing) = .18/.32 = 9/16

Wish You the Best in your Studies.
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