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Thread: Probability summation help

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    Probability summation help




    I have the following problem:

    Two cups, A and B, each contain 1 ml of the same infectious serum. If there is a 30% probability that I will get the disease from drinking cup A and a 30% probability I will get the disease from drinking cup B, what is the probability of getting the disease if I drink both A and B?

    I'm fairly certain I just add the probabilities. But I'm not sure because the cups contain the same thing. Thank you!

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    Re: Probability summation help

    Pretend for a second that instead of 30% the problem said 90%. Do you see an issue with your proposed approach?
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    Re: Probability summation help


    Yes, now I do see an issue with my approach. So does that mean it's a 30% probability no matter what because they are exclusive events?

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