propsguy
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propsguy added an answer to a question One Girl  One Boy
Yes, we have gone over and over it, but I've been spurred to attempt to make my point again.
I will agree that the answer is supposed to be 1/3;1/3 is the answer the judges are looking for. But as the puzzle is written, the answer is 1/2.
The puzzle is written as:
"Ok, so Teanchi and Beanchi are a married couple (dont ask me whose he and whose she)!
They have two kids, one of them is a girl, what is the probability that the other kid is also a girl.
Assume safely that the porbability of each gender is 1/2."
The puzzle should have been written as:
Ok, so Teanchi and Beanchi are a married couple (don't ask me who's he who's she)!
They have two kids. At least one of the kids is a girl. What is the probability that both kids are girls?
Assume safely that the probability of each gender is 1/2."
There is a big diffence between the two puzzles above (aside from spelling and grammar mistakes).
The way the puzzle was presented, we are asked the probability of one child. That "other kid". The probability of any "other kid" being a girl is 1/2.
The way the puzzle should have been presented, the answer is 1/3. The way it should have been presented makes the gender of both children a variable.
The way it was presented makes the gender of only one of the kids a variable. Not a particular kid, as I may have previously indicated, but one of them. Take yer pick!
In the simplest terms, the 1/3 camp has come to their answer using the gender of both kids as variable. As a member of the 1/2 camp, I have come to my answer using the gender of only one kid as variable. Just as the question asks: "What is the probability the other kid is also a girl."
I don't care which of the kids is the "one of them" girl. We are asked about the probability of "the other kid."
We are never asked about the probability of both kids being girls.
(By the by, I think this is a great puzzle, and a great forum. Thanks.)

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propsguy added an answer to a question One Girl  One Boy
Ok guys, I was willing to let it go, but now I've been forced to reach into my bag of tricks and open up a can of logical whupa** on you all.
"One of them is a girl. What is the probability the other kid is also a girl?"
"One of them." "The other kid."
and again,
"One of them." "The other kid."
I'm not saying the OP assigned one of the children to be a girl. The question itself assigns one of them.
Seems clear to me:
There is "one", and there is the "other." We are asked about the probability of "The other kid."
I don't care if it's the first or the second born. I don't care how you look at it: "One of them is a girl." As soon as you ask about "the other" you've made that "other" the subject of the probability.
And the probability of "the other one" being a girl is 1/2.
Nuff said.

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propsguy added an answer to a question socks
That's about what I did to get my answer above. 1:4.5 could have read 2/9. The probablility is once in wvery 4.5 draws.

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propsguy added an answer to a question 5 short ones
1) Your word.

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propsguy added an answer to a question socks
By Jove, I think I've got it, though Mdsl seems to have posted a response too. Before I read his, I'll submit mine....
The chances of getting a black pair "in" any of the mentioned draws is 1:4.5

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propsguy added an answer to a question A Riddle
hmmmm. maybe "what is (at my) computer keyboard"

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propsguy added an answer to a question Lost Time
I would guess it has something to so with him starting in, say, Hawaii or Alaska, and flying at a precise speed before landing in specific locations. Maybe the earth's rotation affecting his southward bearing?
Or, Maybe it is just too hard.

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propsguy added an answer to a question The liar, the truth teller....and the random answerer
Holy crap is that good Writersblock!
I'm looking for the "Bowdown" key on my computer.

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propsguy added an answer to a question A Riddle
what is (at my) computer??

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propsguy added an answer to a question One Girl  One Boy
I think it might be a notsosneaky way of saying "I read too much into the puzzle"
I thought the puzzle was working with an additional, or deeper twist:
like:
"you have two coins in your pocket totalling 30 cents in value. One of them is not a quarter"
That classic works as a puzzle, specifically because it does assign. So when I looked over the words "one of them" I took that to be a crucial part of the puzzle.
I've been wrong before and I'll be wrong again Dammit.
Sneaky?... not so much.

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propsguy added an answer to a question socks
Oww, my head hurts.
A question for you: If the first sock happens to be a white one, and you put it back does the next sock picked count as the 2nd draw, or the 1st? I'm assuming that you mean it to count as the 2nd. And so on....

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propsguy added an answer to a question One Girl  One Boy
Thanks Unreality. And Martini.
I've read your explanation and the rest of the thread. And I know how the answer is supposed to be 1/3 But...
It does come down to the wording.
"One of them is a girl"
versus
"One of which is a girl"
The statement in the riddle is not "One of which" though. Nor is it "At least one of them is a girl"
It's a matter of assigning. As soon as you say "one of them" you've assigned, say, the first born, or the second born to be a girl. If one of them, say the first born, is in fact a girl, the chances of the other being a girl are 50%.
in:
G/B
B/G
G/G
it does look to be 1/3. But, by assigning, by saying "one of them is a girl" I submit that you can, in a way, add a second G/G set.
Or, of those 6 kids, 4 are girls. The chances of "one of them" girls having a sister is 50%.
Semantics maybe, but that's how I see the puzzle.
But then again, I may just be "one of them" guys.

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propsguy added an answer to a question Desert Treasure!
Like a mom's trick with two children and the last piece of cake: one gets to cut, the other gets to choose.

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propsguy added an answer to a question me and Alexander Hamilton
Hamilton was Burr's second in the duel. They were on the same 'side'?

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propsguy added an answer to a question just a riddle
An umbrella?

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