Math Is Fun Forum

juantheron

Member

Registered: 2011-10-19

Posts: 312

shoe probabiliy

There are 5 pair of shoes .The no. of ways in which 4 shoes can be drawn from it such that there will be exactly one pair is

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: shoe probabiliy

Hi,

I'm getting

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"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

juantheron

Member

Registered: 2011-10-19

Posts: 312

Re: shoe probabiliy

Thanks gar

explanation required....

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: shoe probabiliy

Hi juantheron;

gAr used the famous Feller formula for these type problems.

npairs = 5;
2r = 4

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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.

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: shoe probabiliy

Hi bobbym,

I did not know there was a formula for this problem!

---

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: shoe probabiliy

Hi gAr;

I did not know it either until a couple of pdf's I was looking at got the wrong answer!

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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.