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Binomial

Given x~B(20,0.6). Find P(X> or equal to 18).

$\sum_{18}^{20}C(20,k)(.6)^{k}(.4)^{20-k}$

Or if you prefer in that format, which you then simplify:

$P (X \geq 18) = P(X = 18) + P(X = 19) + P(X = 20)$

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