In a drug study of a group of 500 patients, 150 patients responded positively to drug #1, 200 patients responded positively to drug #2 and 90 patients responded positively to both drug #1 and drug #2. (a) What is the probability that a patient responds positively to either drug #1 or drug #2? (b) What is the probability that a patient responds positively to drug #1 given that this patient responded positively to drug #2?

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In a drug study of a group of 500 patients, 150 patients responded positively to drug #1, 200 patients responded positively to drug #2 and 90 patients responded positively to both drug #1 and drug #2.

(a) What is the probability that a patient responds positively to either drug #1 or drug #2?
(b) What is the probability that a patient responds positively to drug #1 given that this patient responded positively to drug #2?

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