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10 cards from this deck
p^3 + 3p^2q + 3pq^2 + q^3
Use nCr: 5C0, 5C1, 5C2, 5C3, 5C4, 5C5
n = trials, p = success probability
Fixed trials, independent trials, two outcomes
Use P(X = k) = (nCk)(p^k)(q^(n-k)) for k=2.
Use 1 - P(X ≤ 2) with binomial probabilities.
Mean = 40
'At least' means ≥
Use 1 - P(unwanted outcomes)
It's more efficient for multiple trials.
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