The probability that a randomly chosen male has a blood circulation problem is 0.25. Subjects can either have a blood circulation problem (C) or not have a problem (CC). Males who have a circulation problem are twice as likely to be smokers as those who do not have a circulation problem. Subjects can either be a smoker (S) or be a non-smoker (SC). 1. What is the conditional probability that a male has a circulation problem, given that they are a smoker (that is P(C|S))?

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