The doctor figured out that there are two reasons for smoking. The influence of friends (F) during teen years (apparently, teens smoke to look as cool as their friends) and having parents (R) who smoke (apparently, kids inhale as much nicotine as their parents when these smoke, and nicotine is addictive). F and R are also binary variables. He updated the BN to the following: P(R) = 0.01 Parents Friends P(F) = 0.09 P(S | R,F) = 0.95 smoking P(S | R, not F) = 0.8 P(S | not R, F) = 0.6 P(S | not R, not F) = 0.05 P(C|S) = 0.85 P(B |S) = 0.75 P(C | not S) = 0.4 cancer Bronchitis P(B | not S) = 0.1 Using the chain rule, calculate P(C, B, S, R, F)