Question 900169
<pre>
There are only 3 ways to split them:         

1. {B1, B2} and {G1, G2}
2. {B1, G1} and {B2, G2}
3. {B1, G2} and {B2, G1}

Only case 1 is one 2-boys team and one 2-girle team.

That's 1 out of 3, so the probability is 1 over 3 or {{{1/3}}}

Edwin</pre>