I am confused with what numbers I should put on top of my probability fraction. I have three numbers: # of ways for someone to choose 7 #s from 80 = C(80,7), # of ways for the computer to choose 11 numbers from 80 = C(80,11), and # of ways someone could have chosen the 7 from the 11 = C(11, 7). I think I understand that the number C(11, 7) is the total number of lottery numbers that are winners. And that the total number of lottery number is C(80, 11), but what do I do with C(80,7)?
~James Gilmore
I'm not sure if this is right, but my answer was C(11,7)/C(80,7). -Zoe
