You place a 1-dollar bet on the number 17 at Las Vegas, and your friend places a 1-dollar bet on black (see exercise and exercise). Let [math]X[/math] be your winnings and [math]Y[/math] be her winnings. Compare [math]E(X)[/math], [math]E(Y)[/math], and [math]V(X)[/math], [math]V(Y)[/math]. What do these computations tell you about the nature of your winnings if you and your friend make a sequence of bets, with you betting each time on a number and your friend betting on a color?