Wanna debate a math problem?
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23-02-2012, 04:42 PM
RE: Wanna debate a math problem?
(23-02-2012 04:36 PM)daylightisabadthing Wrote:  All possible combinations : BB BG GB GG

The older child is a girl rules out BB and BG leaving 2 possibilities so the chance 50%.

One of the children is a boy rules out GG leaving 3 possibilities so the chance is 33.3%

Well crap... it was so simple... now I feel stupid.

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23-02-2012, 04:47 PM
RE: Wanna debate a math problem?
(23-02-2012 04:36 PM)daylightisabadthing Wrote:  All possible combinations : BB BG GB GG

The older child is a girl rules out BB and BG leaving 2 possibilities so the chance 50%.

One of the children is a boy rules out GG leaving 3 possibilities so the chance is 33.3%


I see. Misinterpretation on my part. I forgot to account for the fact that we already know one of the children is a boy. I was reading as if we were figuring what the chances of having 2 boys is.

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23-02-2012, 04:55 PM
RE: Wanna debate a math problem?
You couldn't figure it out from the example I gave?

Gee... next time I give you the answer, I'll leave my vagina home. Dodgy

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23-02-2012, 05:03 PM
RE: Wanna debate a math problem?
(23-02-2012 04:55 PM)kim Wrote:  You couldn't figure it out from the example I gave?

Gee... next time I give you the answer, I'll leave my vagina home. Dodgy

Your vagina should be in the kitchen where it belongs.































































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23-02-2012, 05:10 PM
RE: Wanna debate a math problem?
[Image: 1.gif]

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23-02-2012, 05:15 PM
RE: Wanna debate a math problem?
(23-02-2012 05:10 PM)kim Wrote:  [Image: 1.gif]

I can't see most gifs at work. But I'll assume it's you blowing me a kiss. Will rep tomorrow.

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23-02-2012, 11:31 PM
RE: Wanna debate a math problem?
(23-02-2012 05:15 PM)germanyt Wrote:  
(23-02-2012 05:10 PM)kim Wrote:  [Image: 1.gif]

I can't see most gifs at work. But I'll assume it's you blowing me a kiss. Will rep tomorrow.

That's exactly what it's doing.

Why is stats such a mindfuck?
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24-02-2012, 12:16 AM
RE: Wanna debate a math problem?
(23-02-2012 04:36 PM)daylightisabadthing Wrote:  All possible combinations : BB BG GB GG

The older child is a girl rules out BB and BG leaving 2 possibilities so the chance 50%.

One of the children is a boy rules out GG leaving 3 possibilities so the chance is 33.3%

But why does order matter? IMO, from the initial question, GB = BG. There'd only be two options there - a family with one boy and one girl or a family with two boys. (GB/BG or BB). There isn't any reason from the initial question that the age of the children is a factor... I see where they are coming from, but unless order of birth is a part of the question, I don't see how it's adding an additional possibility besides boy + boy or boy + girl. It's a possible arrangement, but if we're just trying to guess the probability that both are male the order doesn't matter... Could we also throw in the possibility that one is a hermaphrodite? That one is transgender and identifies as a female, though born with male parts? You could make the probability quite low by adding "possible scenarios" like that...

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24-02-2012, 12:42 AM (This post was last modified: 24-02-2012 12:49 AM by kim.)
RE: Wanna debate a math problem?
(24-02-2012 12:16 AM)Azaraith Wrote:  
(23-02-2012 04:36 PM)daylightisabadthing Wrote:  All possible combinations : BB BG GB GG

The older child is a girl rules out BB and BG leaving 2 possibilities so the chance 50%.

One of the children is a boy rules out GG leaving 3 possibilities so the chance is 33.3%

But why does order matter? IMO, from the initial question, GB = BG. There'd only be two options there - a family with one boy and one girl or a family with two boys. (GB/BG or BB). There isn't any reason from the initial question that the age of the children is a factor... I see where they are coming from, but unless order of birth is a part of the question, I don't see how it's adding an additional possibility besides boy + boy or boy + girl. It's a possible arrangement, but if we're just trying to guess the probability that both are male the order doesn't matter... Could we also throw in the possibility that one is a hermaphrodite? That one is transgender and identifies as a female, though born with male parts? You could make the probability quite low by adding "possible scenarios" like that...

The question is about the number of possibilities that will go into this one choice.

In each group of two children, we already know one of those two is a boy. So...

We have the boy and a boy. This is one possibility.
We have the boy and a girl. This is one possibility.
We have the boy and a child of unknown sex -could be boy or girl. This is one possibility.

There are three possibilities for this one choice.
1/3 = 33.3%
Dodgy

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24-02-2012, 12:53 AM
RE: Wanna debate a math problem?
(24-02-2012 12:42 AM)kim Wrote:  
(24-02-2012 12:16 AM)Azaraith Wrote:  
(23-02-2012 04:36 PM)daylightisabadthing Wrote:  All possible combinations : BB BG GB GG

The older child is a girl rules out BB and BG leaving 2 possibilities so the chance 50%.

One of the children is a boy rules out GG leaving 3 possibilities so the chance is 33.3%

But why does order matter? IMO, from the initial question, GB = BG. There'd only be two options there - a family with one boy and one girl or a family with two boys. (GB/BG or BB). There isn't any reason from the initial question that the age of the children is a factor... I see where they are coming from, but unless order of birth is a part of the question, I don't see how it's adding an additional possibility besides boy + boy or boy + girl. It's a possible arrangement, but if we're just trying to guess the probability that both are male the order doesn't matter... Could we also throw in the possibility that one is a hermaphrodite? That one is transgender and identifies as a female, though born with male parts? You could make the probability quite low by adding "possible scenarios" like that...

The question is about the number of possibilities that will go into this one choice.

In each group of two children, we already know one of those two is a boy. So...

We have the boy and a boy. This is one possibility.
We have the boy and a girl. This is one possibility.
We have the boy and a child of unknown sex -could be boy or girl. This is one possibility.

There are three possibilities for this one choice.
1/3 = 33.3%
Dodgy

But along the same logic, there's the possibility that the other child would be a hermaphrodite or transexual, so are we to include those too and make the probability 20% instead? (since hermaphrodite and transgender aren't "unknown sex") Or are we grouping them into "unknown sex" as an "other" category???

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