Difference between revisions of "MA 375 Spring 2009 Walther Homework 5 Number 14" - Rhea

Revision as of 12:42, 13 February 2009

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 [[Category:MA375Spring2009Walther]]
 '''[[MA 375 Spring 09 HW 5|Back]]'''
-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