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a ) P( A/B) =P ( A and B) / P(B)

for mutually exclusive events, P ( A and B) = 0

so, P( A/B) = 0/ 0.09 = 0.................................answer

b ) P( B/A) =P ( A and B) / P(A)

so, P( B/A) = 0/ 0.45 = 0.................................answer

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