Manchester United beat Liverpool 4–2 at soccer, but you do not know the order in which the goals…

Manchester United beat Liverpool 4–2 at soccer, but you do
not know the order in which the goals were scored. Draw a tree diagram to
display all the possibilities and use it to find (a) the probability that the
goals were scored in the order L, MU, MU, MU, L, MU, and (b) the probability
that the score was 2–2 at some stage.