The probability that at most three lines are in use is the probability of x-values 0, 1, 2, or 3. In other words, P(X ≤ 3) = P(X=0 or 1 or 2 or be p(0), so the expression above can be written p(0) + p(1) + p(2) + p We can denote the probability P(X= 0) to
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