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#1 2011-12-18 16:11:59
- juantheron
- Member
- Registered: 2011-10-19
- Posts: 312
ball probability
A bag contain 8 red and 6 green balls. three balls are drawn one after another without replacement .
find the probability that at least 2 balls drawn are green
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#2 2011-12-18 16:16:20
- juantheron
- Member
- Registered: 2011-10-19
- Posts: 312
Re: ball probability
i understand like this way
at least two ball drawn are green means two ball drawn are green + all three balls drawn are green
but not getting answer
answer is = 5/13
thank
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#3 2011-12-18 16:55:06
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: ball probability
Hi;
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#4 2011-12-18 17:26:50
- jonny
- Guest
Re: ball probability
thanks bobbym got it
#5 2011-12-18 17:31:37
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: ball probability
Yikes! Who is jonny?
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#6 2011-12-19 00:22:59
- anonimnystefy
- Real Member
- From: Harlan's World
- Registered: 2011-05-23
- Posts: 16,049
Re: ball probability
hi bobbym
maybe that's juan. 
anyway,who the what now is geometric multinomial distribution? why not just use the probability tree???
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.
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#7 2011-12-19 00:31:47
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: ball probability
Hi;
The multi hypergeometric distribution is from statistics and it never hurts to have a few more weapons. Besides the tree can become too tedious when things get large.
Supposing there were ten different colored balls with different amounts and you were asked for the probability that you picked 5 colors and 5 of each. You would run out of paper trying to draw the tree.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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