Answered

Jennie purchased 5 of the 200 tickets at the raffle. There will be two drawings for a prize. What is the probability that Jennie will win both of the prizes?

Answer :

AL2006

OK.  So they sold 200 raffle tickets, and Jennie bought 5 of them.
What has to happen now in order for Jennie to win both prizes ?

-- First drawing.  Jennie wins.
   Probability  =  (5 tickets) / (200 possible draws)  =  5/200

   Now there are 199 tickets left in the barrel, and Jennie has 4 .

-- Second drawing.  Jennie wins.
    Probability  =  (4 tickets) / (199 possible draws)  =  4/199 .

The probability of it happening just this way is

                   (5/200) x (4/199)

             =    (5 x 4)  /  (200 x 199)

             =      20      /      39,800

             =            2  /  3,980  =  1 / 1,990 

             =                                0.0005025...  =  0.05 %  (rounded) 

Other Questions