There are 11 Republicans and 12 Democrats on a committee. A sub committee of four is selected at random. What is the probability that all are Republicans, given that at least two are Republicans?

Question

anonymous · Answer

First, what is the probability that at least one is a Republican?

goformit100 · Answer

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anonymous · Answer

I don't know how to even begin to figure this out. I've tried using a/b equation from my professor but can't seem to get it right?

anonymous · Answer

all are republicans intersect 2 are republicans divided by 2 republicans is what I am trying to use.. Does anyone know if this is correct?? Every time I put in the combinations the program says it is wrong. I do not know what else to do.