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Suppose the joint distribution of A and B is F(a,b)=1-e-31a-e-9b+e-(31a+9b), if a>0, b>0, and F(a,b)=0 otherwise....

Suppose the joint distribution of A and B is F(a,b)=1-e-31a-e-9b+e-(31a+9b), if a>0, b>0,
and F(a,b)=0 otherwise. What is (1/a) * -ln( 1-FA(a) ) ?

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