Don't talk nonsense if you don't understand upstairs. Is probability theory that simple in arithmetic? ! !

Three wins: P = 8/27；;

Four wins: P=3*(8/27)*( 1/3)=8/27.

Five wins: P= 16/8 1

The total winning percentage is: P=64/8 1.

I hope the landlord will adopt it and comment on me as the best!