hno:
Stole this from somewhere
P(B) = 0.5
P(G) = 0.5
P(other=G | talkabout=B) = [P(B)P(G) + P(G)P(B)] / [P(B)P(B) + P(B)P(G) + P(G)P(B)]
P(other=G | talkabout=B) = (0.5*0.5 + 0.5*0.5) / (0.5*0.5 + 0.5*0.5 + 0.5*0.5)
P(other=G | talkabout=B) = 0.666667
So: the probability of the other child being a girl is 67%
P(B) = 0.5
P(G) = 0.5
P(other=G | talkabout=B) = [P(B)P(G) + P(G)P(B)] / [P(B)P(B) + P(B)P(G) + P(G)P(B)]
P(other=G | talkabout=B) = (0.5*0.5 + 0.5*0.5) / (0.5*0.5 + 0.5*0.5 + 0.5*0.5)
P(other=G | talkabout=B) = 0.666667
So: the probability of the other child being a girl is 67%
I log into therx to see this debate still going....LOL
I'd like to officially change my answer....
my new answer is 100%
what kind of idiot will talk about his son as if he had only one without making reference to if the son is the older or the younger boy....NO DOUBT it is a girl!!!!!
WHOOOOOOTTTT!!!! trying to round up another gang of debaters....join me 100% crew!
I'd like to officially change my answer....
my new answer is 100%
what kind of idiot will talk about his son as if he had only one without making reference to if the son is the older or the younger boy....NO DOUBT it is a girl!!!!!
WHOOOOOOTTTT!!!! trying to round up another gang of debaters....join me 100% crew!
I would argue that the "math types" are trying to force an equation that isn't there. And while the math is correct based on the way you are interpreting the riddle, you aren't seeing that you are reading too much into a totally irrelevant sentence.
"A man tells you he has two children. He then starts talking about his son.
(meaningless sentence removed)
What is the probability that his other child is a girl? "
The things we know:
A man has 2 kids
One is a boy
The only question being asked:
What are the chances that the other child is a girl?
There is no difference between GB & BG. There are only two possibilities, he's got 2 boys or one of each.
"Other" does in fact mean "remaining"
Let's say said 'man' was standing in front of us. And said 'son' is also standing in front of us. The "other" child is in a fucking box right next to them. You gonna give me 2 to 1 odds on whether the kid in the box has a dick or a snatch?
"Other" does NOT mean "remaining". The scenario you give implies that we know which kid is the son which is a different scenario that was presented in the original problem. In the problem we don't know which kid is a boy. That's the difference.
Just like in shdw01's card scenario. The guy tells us one coin is heads but we don't know which one. That gives us more uncertainty which means we have more possibilities.
Even though we all think the other half of the forum is retarded, I think we should all take comfort in knowing both sides UNDERSTAND the other point of view....I think it is just a debate on how the question is stated and what certain words/phrases ACTUALLY mean.
fwiw, you are all wrong....100% BABY!
fwiw, you are all wrong....100% BABY!
Yeah, I understand after 16 pages and counting we have some really stupid fucks around here. Not only that, I've noticed a lot of people have problems reading properly too. The sad part about all this is, even after it's explained and proven why 2/3 is the right answer, there are still plenty who can't accept it and believe 50% is still right. This country is in downward spiral.
I hear ya QL, but that begs another question?
Where in the original post does it say that we do NOT know "which" kid is the son?
A man tells you he has two children. He then starts talking about his son. He does not tell you whether the son is the oldest child or the youngest child. What is the probability that his other child is a girl?
The second sentence is completely and utterly meaningless and leading the "math types" astray.
It may as well read:
A man tells you he has two children. He then starts talking about his son. He does not tell you whether his wife has herpes. What is the probability that his other child is a girl?
It matters not what he DOESN"T tell you. The ONLY two facts we know are that he has 2 kids and one is a boy.
If this little bastard is telling us the truth....ONE of his kids has male parts. What does the OTHER one have? The are only two possibilities.
This is more of a reading comprehension question than a math problem.
