One of your wiseguy friends, Tony, wants to place $2000 on Yankees to win the world series. He remembers you owing him a favor, therefore he asks you to be in charge of it. He wants $4000 if the Yankees win the whole thing, and nothing otherwise.
Forcedly, you stand up for the challenge. However, the bookies refuse to take bets on the whole series, but they do take even-odd bets on every single match. How would you arrange your bets so that Tony is satisfied?
PS: The world series consist of 7 matches between two teams, once a team reaches four wins, it wins the series