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@ Probability

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1 @ Probability on Sun Mar 07, 2010 6:50 am


A couple has two children. One of them is a boy. What is the probability that the other one is also a boy?

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2 answer should be 1/2 on Mon Mar 08, 2010 2:36 pm

I think answer should be 1/2.
As total no of set will be (B,B) and (B,G).
so, probability of one boy will be 1/2.

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3 @---amit---@ on Tue Mar 09, 2010 1:24 am


1/2 is not correct

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4 @lucifer on Tue Mar 09, 2010 2:00 am

can you explain why it won't be 1/2.
There is only two set (B,B) and (B,G). (G,B) will be same as (B,G) and (G,G) won't come into the picture because one of them is boy.
So, probability will be 1/2.
If not then give me ur reasoning.

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5 Re: @ Probability on Thu Mar 11, 2010 12:32 am

Even I feel answer should be 1/2. What a Face

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6 @everyone on Sun Mar 14, 2010 4:47 pm


Well the correct answer is 1/3. Can somebody try to figure out y it is so?

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7 yes the answer is 1/3 on Mon Mar 15, 2010 12:17 am

Lucifer, Amit,
If I understand the problem correctly, number of kids is fixed to 2 and just "one of them" is a boy.
In that case, we have three possibilities for the kids (say A and B)

A | B
Boy | Girl
Boy | Boy
Girl | Boy

So, isnt it obvious that odds of both being boys is 1/3 Smile

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8 @ravi on Mon Mar 15, 2010 2:20 am

why you are taking B,G and G,B both. I think both are same in this case.

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9 @Sneha on Tue Mar 16, 2010 3:05 am

There is difference.
Question says "One of them is boy"
So "A" can be boy or "B" can be boy. ( B,G and G,B are different cases)
or Both of them. That's why answer is 1/3

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10 @ravi,incognito,lucifer on Wed Mar 17, 2010 5:21 pm

i think this question is a paradox so ur answer can not be justifiable.
Please go through the below link in wiki..

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