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Q: 

Conditional probability in a joint probability distribution

Given this joint probability distribution, I need to figure out P(Cavity | Toothache OR Catch).

I know that 

P(Cavity | Toothache OR Catch) = P(Cavity AND (Toothache OR Catch)) / P(Toothache OR Catch)

but I'm not sure how to solve the numerator here.

Thanks.

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