Chances of winning a raffle? If there is a raffle going on and tickets for the raffle are $20, Prizes are as follows.
1st = 1000
2nd = 200
3rd = 100  
If there are only 1000 tickets for sale, how do I go about working out the expectation of how much I would win.
 Assuming that once a ticket is taken out it is not put back in.
Im assuming that my expectation is 1/1000 for 3rd prize, 1/999 for 2nd and 1/998 for third and thats it? It seems too simple of an answer for such a high mark question on one of my tests.. :\

Actually the expectation is $\frac{1}{1000}$ for each prize, giving you expected earnings of $\$ 1.30$.
You can see this more concretely as follows: In total, $\$1300$ will be given away to $1000$ people.  Each has the same expectation.
