a boy and a girl

this is an IQ question…

A two-child family has at least one boy.

What is the probability that the family has a girl?

answers below

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its 2/3

first u need to establish the sample size… let B = boy and G = girl

for a family with at least a boy u get all these possibilties

[B,G]  [G,B]  [B,B]
so for there to be a girl, chances are 2 out of 3… dun get it?

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