hno:
wow. this is crazy. im on my mobile, but if someone could draw up a simple flow chart to demonstrate that the answer is 2/3...
boy
boy
boy
girl
girl
girl
girl
boy
first one is first born, second is the second born.
what the fuck is wrong with you guys not thinking its 2/3 ???!!?!! its 2/3. this thread needs to be locked or some shit. i mean.... really?? i was SURE it was 50percent but realized i was wrong. I FEEL LIKE IM TAKING CRAZY PILLS!!:cripwalk:
arty::wink:ope::smoking:
boy
boy
boy
girl
girl
girl
girl
boy
first one is first born, second is the second born.
what the fuck is wrong with you guys not thinking its 2/3 ???!!?!! its 2/3. this thread needs to be locked or some shit. i mean.... really?? i was SURE it was 50percent but realized i was wrong. I FEEL LIKE IM TAKING CRAZY PILLS!!:cripwalk:
arty::wink:ope::smoking:
I answered the question presuming the guy talking about a son could be talking about either of his two kids. Thought about the averages of the second one's sex....that's where I got the 50%. Haven't read the whole thread but I think back to the chicken that someone made an alleged seven dollars on, was that ever finalized?
Fucking unbelieveable.
I read the 1st page of this thread, and now it is 15 pages long?
The answer is 50%, and there is no arguement.
Here is the proof.
Consider these four statements.
A woman is about to give birth to her first child. What is the probability of it being M/F?
A woman is a mother of one child. What is the probability of it being M/F?
A woman has one child, and is about to give birth to her second child next week. What is the probability of it being M/F?
A woman has two children. She spoke of her eldest being a boy. What is the probability of the second child being M/F?
These fucking four statements say the exact same fucking thing! It's 50%!!
That's why people lose at gambling. Cannot do math. Cannot even read English!
Whew! Glad to get that off my chest, LOL.
:nohead:
I read the 1st page of this thread, and now it is 15 pages long?
The answer is 50%, and there is no arguement.
Here is the proof.
Consider these four statements.
A woman is about to give birth to her first child. What is the probability of it being M/F?
A woman is a mother of one child. What is the probability of it being M/F?
A woman has one child, and is about to give birth to her second child next week. What is the probability of it being M/F?
A woman has two children. She spoke of her eldest being a boy. What is the probability of the second child being M/F?
These fucking four statements say the exact same fucking thing! It's 50%!!
That's why people lose at gambling. Cannot do math. Cannot even read English!
Whew! Glad to get that off my chest, LOL.
:nohead:
I see we have a new group of people for the night who may not have read or discussion from the day so I'll repeat myself.
The wording is tricky. Most people are confusing "other child" to mean "remaining child".
When the question asks "other child" it opens up the case where the child can be oldest or youngest since these possibilities exist. Therefore "other child" can mean older or younger as well and that gives us 3 total possibilities of which 2 can be a girl.
The wording is tricky. Most people are confusing "other child" to mean "remaining child".
When the question asks "other child" it opens up the case where the child can be oldest or youngest since these possibilities exist. Therefore "other child" can mean older or younger as well and that gives us 3 total possibilities of which 2 can be a girl.
Screw the math...As the title states, this is a LOGIC problem, not a math, statistics or probability problem.
If he "He does not tell you whether the son is the oldest child or the youngest child"....than it's safe to assume that it NEVER came up. Therefore the problem would read.....
LOGICALLY the answer is 50%.
IF the question read:
Then the math kicks in and the answer is 66.7%
Left brain vs. right brain.
If he "He does not tell you whether the son is the oldest child or the youngest child"....than it's safe to assume that it NEVER came up. Therefore the problem would read.....
LOGICALLY the answer is 50%.
IF the question read:
Then the math kicks in and the answer is 66.7%
Left brain vs. right brain.
did you even read my post? Any logical person would remove this sentence from the equation
"He does not tell you whether the son is the oldest child or the youngest child".
Because, LOGICALLY, you can infer that it never came up.
He's either got a BG or a BB.
If he did mention that the the Boy may be the eldest or he may be the youngest....Than of course the math dictates 67%
"He does not tell you whether the son is the oldest child or the youngest child".
Because, LOGICALLY, you can infer that it never came up.
He's either got a BG or a BB.
If he did mention that the the Boy may be the eldest or he may be the youngest....Than of course the math dictates 67%
Originally Posted by MrMore
I flip 2 coins in the air and catch one in each hand, then slam them down on the table.
I turn over my left hand and reveal heads.
What are the chances the coin under the my right hand is tails?
Here is shdw01's explanation that takes out the older child/younger child scenario. I feel this puts all questions to rest.
I flip 2 coins in the air and catch one in each hand, then slam them down on the table.
I turn over my left hand and reveal heads.
What are the chances the coin under the my right hand is tails?
Here is shdw01's explanation that takes out the older child/younger child scenario. I feel this puts all questions to rest.
Take out the fact that one is older than the other. Say that he has twins, one boy and one girl. If he says one child is a boy, what are the chances that the other is a girl? "The other" does not mean "remaining child" in this situation. That's the confusing point. "The other" means how many possibilities is the child not a boy.
2 out of 3:
1 child is a girl, the other child is a boy
1 child is a boy, the other child is a girl
1 child is a boy, the other child is a boy
You have to have 2 separate possibilities for 1 boy/1 girl since there are 2 separate children.
"He does not tell you whether the son is the oldest child or the youngest child"
Therefore, you are not being asked to even considerthe order in which they came. Or in Shadows example...left hand or right hand.
The only question being asked in the original post is:
What is the probability that any given child is a female."He does not tell you whether the son is the oldest child or the youngest child"
If he doesn't tell you, it never came up. Age/order is not a consideration.
If I asked you:
"What's up QL, I've got 2 kids & one is a boy. What are the chances the other is a girl?"
What is your answer?
It's my contention that it is illogical to interpret the following the sentence:"He does not tell you whether the son is the oldest child or the youngest child"
To mean:
"He tells you the son could be the oldest child or could be the youngest child"
(Heads may be in the left hand or may be the right hand)
I would answer the same way. See my previous post #376 in this thread. One being older than the other doesn't matter.
What DOES matter is that they are 2 separate individuals and therefore "chances" as asked in the question must take "1 boy/1 girl" and "1 girl/1 boy" as 2 separate "chances". The third "chance" is that he has 2 boys.
