The Children Problem

Is the answer

A) 1/4
B) 1/3
C) 1/2
D) 2/3

Solution

This problem requires you to consider the combinations of children that could Mrs Blogg have.

She could have

Boy Boy
Boy Girl
Girl Boy
Girl Girl

We know however that she has at least one boy which rules out the possibility of her having two girls. This leaves

Boy Boy
Boy Girl
Girl Boy

2/3 options means that she has a daughter and so the answer is D) 2/3.

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