Question 1101533
if he registers his first win in the fifth round, that means he lost in rounds 1 through 4.


the probability that he wins a game is 3/4.
the probability that he loses a game is therefore 1 - 3/4 = 1/4


the probability that he loses in the first four round and then wins in the fifth round is therefore:


1/4 * 1/4 * 1/4 * 1/4 * 3/4.