A biased (weighted) coin is designed so that the probability of a head on each flip is 3/5
If this biased coin is flipped until exactly 2 heads appear, what is the probability that it takes exactly 3 flips until the second head appears?
I drew a tree diagram but i dont really understand what it is asking for,
there is an answer given
P(2H in 3 flips) = 36/125 But this doesnt make sense to me.