Question

a man has 2 kids, and they are not 2 girls, what's the chance that they are 1 boy 1 girl?

Answer 1

so we hav 2 more chances 2 boys or 1 boy and 1 girl
hence probability of 1 boy amd 1 girl is 1/2

Answer 2

B G
B B
G B

I'd say 2/3.

Answer 3

2/3

Consider the 4 possibilities for older and younger child:
Boy, boy
Boy, girl
Girl, boy
Girl, girl

We know that they are not both girls, so we can eliminate the last possibility. Thus there are 3 possible scenarios and 2 of them have one boy, one girl.

Answer 4

hmm oopps :P ya 2/3

Answer 5

Oh Thank you Blacksteel, you agree with me!