Math Probability
posted by Tina .
A certain state's lottery game, LOTTO, is set up so that each player pays $1 per ticket and chooses six different numbers between 1 and 20 inclusive.(the order doesn't matter) If the six numbers chosen match the six numbers drawn, the player wins the grand prize
If a person buys 1000 LOTTO tickets, what is his probability of winning the grand prize?

Done here
http://www.jiskha.com/display.cgi?id=1385948148
Why are you switching names? 
I decided to add my name. This is my first time on here, so I wanted to see how it work first.