Binomial Expansion Discussion

What is Binomial Expansion?

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...head) = ½ = p
probability (tail) = ½ = q

p2 + 2pq +q2 = 1 or (p + q)2 = 1

Ex. 5 tosses of a coin

(p + q)^5 = 1

expand equation:
p5 + 5p4q + 10p3q2 + 10p2q3 + 5pq4 + q5 = 1

1 way to get 5 heads.
5 ways to get 4 heads and 1 ...