Question: A person's blood group is determined by whether or not it contains any of 3 substances A, B and C. A doctor surveyed 300 patients'

A person's blood group is determined by whether or not it contains any of 3 substances A, B and C. A doctor surveyed 300 patients' blood and produced the table below. Blood contains Number of patients Only C 100 A and C but not B 100 Only A 30 B and C but not A 25 Only B 12 A, B and C 10 A and B but not C 3 (a) Draw a Venn diagram to show this information. (b) Find the probability that a randomly chosen patient's blood contains substance C. Harry is one of the patients. (c) Given that his blood contains substance A, find the probability that his blood contains all 3 substances

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