For the Stripped-Down Poker game that Felix and Oscar play in Exercise S9, what does the mix of Kings and Queens have to be for the game to be fair? That is, what fraction of Kings will make the...

For the Stripped-Down Poker game that Felix and Oscar play in Exercise S9, what does the mix of Kings and Queens have to be for the game to be fair? That is, what fraction of Kings will make the expected payoff of the game zero for both players?