We now need to find a value for n such that  P(r ≥ 3) ≥ 0.77. Clearly, if we wish to find at least three extroverted professors we will need to interview at least three professors. So, we know that, minimally, n must be at least 3. Since n must be at least 3, suppose we start by trying n = 3, where exactly three professors are interviewed. Here, P(r ≥ 3) can be calculated using the following formula. P(r ≥ 3) = P( ________ ) fill in the blank

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