this is a binomial result
... win or not win
P(w) = .15 , P(n) = .85
(n + w)^10 ... you want the 3rd term
10C2 * .85^8 * .15^2
the probability of winning a carnival game is 15%. Elaine plays 10 times. find the probability that Elaine will win 2 times.
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