If the odds in favour of Boris beating Elena in a chess game are 5 to 4,
what is the probability that Elena will win an upset victory in a best-of-five chess tournament?
I found the probability of Elena winning to be 4/9. Then for winning the first 3 games of the series to be (4/9)^3= 0.088. However the textbook's answer key says the correct answer is 7808/19683 or .397. Can anyone help me please