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

# @ Probability

**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.

As total no of set will be (B,B) and (B,G).

so, probability of one boy will be 1/2.

**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

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

**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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Please go through the below link in wiki..

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JIGYASA » General » Aptitude » **@ Probability**

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