I know this is a really easy problem, but i am confusing myself with it...(adsbygoogle = window.adsbygoogle || []).push({});

there are three people who each have two possible actions-pay, or not pay (with symmetric probabilities of p for pay, and 1-p for not pay).

what is the probability that at least two people pay?

I first thought that it was just p^2, but that can't be right because that doesn't take into account the third person... so I then thought that it was 3p^2, because there are three possible combinations of 2 people paying. Is this all I need to do?

thanks

~feeling stupid

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# Amazingly simple probability question

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