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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,462

Hi all,

2 fair coins are flipped and atleast one of the outcomes is known to be a head., what is the probability that both outcomes are head?

"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."

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,429

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,462

Hi bobbym,

Thanks for looking into it, and thanks for the link!

"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."

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,429

Hi;

Just be careful some of those guys at that link are wrong.

Here is a pdf that you can download that covers the math and answers that question.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,462

Hi,

yes, I verify before accepting any answer!

Thanks for this link too.

"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."

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**Howardroark****Member**- Registered: 2010-10-10
- Posts: 382

Hi gAr,

gAr wrote:

2 fair coins are flipped and atleast one of the outcomes is known to be a head., what is the probability that both outcomes are head?

You are right.. Here's a problem similar to yours..

A couple has 2 children. One of them is a girl. What is the probability that the other is a girl?

I come from a civilization which has given the world the number 0..

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,462

Hi Howardroark,

Thanks for looking into the problem.

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

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