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04 Dec 2003, 12:59
Kudos
Bookmarks
Please help.
I'm trying to understand the concept here.
Stolyar's question:
There are 10 lottery tickets; 5 of these are winners
If Tom chooses 3, what is the odds he wins the lottery?
Please explain how you arrive at the answer.
Thanks,
CJ
I'm trying to understand the concept here.
Stolyar's question:
There are 10 lottery tickets; 5 of these are winners
If Tom chooses 3, what is the odds he wins the lottery?
Please explain how you arrive at the answer.
Thanks,
CJ
Archived Topic
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Updated on: 04 Dec 2003, 13:21
Originally posted by Praetorian on 04 Dec 2003, 13:17.
Last edited by Praetorian on 04 Dec 2003, 13:21, edited 1 time in total.
Last edited by Praetorian on 04 Dec 2003, 13:21, edited 1 time in total.
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csperber
Please help.
I'm trying to understand the concept here.
Stolyar's question:
There are 10 lottery tickets; 5 of these are winners
If Tom chooses 3, what is the odds he wins the lottery?
Please explain how you arrive at the answer.
Thanks,
CJ
I'm trying to understand the concept here.
Stolyar's question:
There are 10 lottery tickets; 5 of these are winners
If Tom chooses 3, what is the odds he wins the lottery?
Please explain how you arrive at the answer.
Thanks,
CJ
Tom chooses 3 and atleast one of them has to be a winning ticket
P( atleast one winning ticket) = 1 - p(no winning ticket)
= 1 - 5/10*4/9*3/8
= 66/72 = 11/12
04 Dec 2003, 13:17
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(5/10) is the probablilty of picking a loser on the first try
(4/9) is the probablilty of picking a loser on the second try, if the first try was unsuccessful
(3/8) is the probablilty of picking a loser on the third try, if the second try was unsuccessful
their product, 60/720, is the chance of not picking a winner,
660/720 is the chance of picking a winner.
(4/9) is the probablilty of picking a loser on the second try, if the first try was unsuccessful
(3/8) is the probablilty of picking a loser on the third try, if the second try was unsuccessful
their product, 60/720, is the chance of not picking a winner,
660/720 is the chance of picking a winner.
