Binomial distribution: P(X = k) for n trials, success probability p:
An × p
Bp^k × (1-p)^(n-k)
CC(n,k) × p^k × (1-p)^(n-k)
Dn^k × p
Answer & Solution
Correct answer: C. C(n,k) × p^k × (1-p)^(n-k)
Binomial: P(X = k) = C(n, k) × p^k × (1-p)^(n-k). For n coin flips, prob of exactly k heads with p = 0.5 success rate.
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