A car salesman sold three hybrid cars last week. The cars come in red white and black. A sale is listed as RWB if a red car was sold first, a was sold second and a black car was sold third.
A list of all possible outcomes is shown. Each outcome has equal probability,
{RRR, RRW, RRB, RWR, RWW, RWB, RBR, RBW, RBB, WWW, WWR, WWB, WRR,
WRB, WRW, WBR, WBB, WBW, BBB, BBR, BBW, BWR, BWW, BWB, BRW, BRR, BRB)
What is the probability that the cars sold last week included a white car or the first car sold was red?