A group of friends take classes at a university in biology, chemistry, and physics. If you selected a friend at random, the probabilities that they take certain classes is given below:
biology class only: P(B)=1/3;
chemistry class only: P(C)=1/2;
physics class only: P(P)=1/6;
biology & physics classes: 1/4.
What's the probability that a randomly chosen friend takes biology or physics, P(B OR P)?
