Question 992094
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The sample space is:
<pre>
    B  B  B   **
    B  B  G   *
    B  G  B   *
    B  G  G
    G  B  B   *
    G  B  G
    G  G  B
    G  G  G
</pre>

There are eight possibilities.  Three of the possibilities have two boys (*), and one has three boys (**).


So the probability of EXACTLY two boys is 3/8.  The probability of AT LEAST two boys is 1/2.  What the question means by "two boys" is a matter of interpretation. You choose which is the correct way to look at it.  The sentence as written is ambiguous and could mean either exactly or at least.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \