An american roulette wheel consists of 38 numbers, of which 18 are red, 18 are black, and 2 are green. When the roulette wheel is spun, the ball is equally likely to land on each of the 38 numbers. A gambler is playing roulette and bets $10 on red each time. If the ball lands on a red number, the gambler wins $10, otherwise the gambler loses $10. What is the probability that the gabmler will be ahead after
1. 100 bets
2. 1000 bets
3 5000 bets