In the game of roulette, there is a wheel with spaces marked 0 through 33 and a space marked 00.

1. Find the probability of winning if you pick the number 7.
2. Find the odds against winning if you pick the number 7.
3. Suppose one pays $1.00 for each play.The casino will pay you $20 if your number comes up and will then return the $1.00 paid.How much profit is the casino making, on average, each time it pays out $20?