Venn diagrams for probability

[percybrencher]

In a group of 39 students, 14 study both Art and Biology.
5 study Biology but not Art.
6 study neither subject.
Given that a randomly selected student studies Art, what is the probability the student studies Art and Biology?

 

[Deleted member 4993]

In a group of 39 students, 14 study both Art and Biology.
5 study Biology but not Art.
6 study neither subject.
Given that a randomly selected student studies Art, what is the probability the student studies Art and Biology?

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[percybrencher]

It's okay, I've figured out how to do it now.