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Binomial Distribution
Binomial = "two names", e.g., "heads" or "tails"
Probability of two heads in three coin flips?
Pr(thh) + Pr(hth) + Pr(hht)
q * p * p + p * q * p + p * p * q = 3 * p2 * q1
Multiply p for each head, q for each tail, then multiply by the number of combinations