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An experiment with only two outcomes ("success" and "failure"), a constant probability of success, a number of independent trials.

Then, if the probability of a success in a trial is p, the probability of r successes in n trials is

nCr*pr*(1-p)(n-r) for r = 0, 1, 2, ..., n.

In case the super-and sub-scripts do not work, that is

n!/[r!*(n-r)!]*p^r*(1-p)^(n-r)

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