4. Two hundred patients suffering from depression enrolled in a clinical trial to test the effects of various antidepressants. Zoloft was given to 27% of patients, Lexapro was given to 30%, and Prozac was given to 27%. Thirteen percent were treated with at least Zoloft and Lexapro, 11.5% were given at least Lexapro and Prozac, 7% were given at least Zoloft and Prozac, and 4% were treated with all three drugs. (a) How many patients in the trial were given at most two of the three drugs? (b) How many patients were treated with Zoloft and Prozac but not Lexapro? (c) How many patients were given a placebo containing none of the three drugs?

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