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#1 2016-10-17 15:18:23

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,264

There are two boxes. Box I contains 5 red balls and 4 white balls. Box II contains 3 red balls and 6 white balls. A ball is taken randomly from box I and put into box II. Then, from box II, two balls are taken randomly. What is the probability of both balls taken from box II are red?

I only know that the probability of getting red ball from box I is

. How to do the rest?

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away. May his adventurous soul rest in peace at heaven.

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#2 2016-10-17 23:21:09

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

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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#3 2016-10-18 04:44:54

Member
Registered: 2016-04-16
Posts: 1,086

Last edited by thickhead (2016-10-18 04:45:39)

{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}
(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha
{Gods rejoice at those places where ladies are respected.}

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#4 2016-10-18 06:05:40

ElainaVW
Member
Registered: 2013-04-29
Posts: 580

Too much notation for such a simple problem don't ya think? I thought there was a rule against just giving away the answer like that?

Give a guy a couple of fish and he's bloated for a day. Teach him how to fish and he can open a good seafood restaurant that bobbym can eat at.

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#5 2016-10-18 06:21:45

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Hi;

I do not eat seafood of any kind.

I thought there was a rule against just giving away the answer like that?

There has been much discussion about that particular point. I do not believe it is posted anywhere in the rules clearly. I would suggest not giving the full answer away but rather try to get the OP do it for himself. Help him along with hints and suggestions or show him a bit of math that can get the answer.

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 2016-10-18 06:26:08

ElainaVW
Member
Registered: 2013-04-29
Posts: 580

You do eat tuna don't you?

There has been much discussion about that particular point. I do not believe it is posted anywhere in the rules clearly. I would suggest not giving the full answer away but rather try to get the OP do it for himself. Help him along with hints and suggestions or show him a bit of math that can get the answer.

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#7 2016-10-18 06:33:40

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Hi;

You do eat tuna don't you?

I do. I am going to make some right now.

No it is not.

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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#8 2016-10-18 15:29:38

Monox D. I-Fly
Member
From: Indonesia
Registered: 2015-12-02
Posts: 1,264