Question 1134508
.
<pre>
{{{C[9]^2*(1/2)^7*(1/2)^2}}} = {{{((9*8)/2)*(1/2)^7*(1/2)^2}}} = 0.0703 = 7.03%.


The term  {{{C[9]^2}}}  gives you the number of ways to select a group of 2 from the the set of 9 committee members.
</pre>