Afaics it's just basic commutativity – p(H)p(T) = p(T)p(H) – since instances are independent. Same, of course, holds for flipping it multiple times. But there

Afaics it's just basic commutativity – p(H)p(T) = p(T)p(H) – since instances are independent. Same, of course, holds for flipping it multiple times. But there you get more than Head or Tail (binomnk(n, k)).