Question 877118
<pre>
The answer would be C(9,4) = 126 committees if there were no restrictions.

However we must subtract the number of committees cosisting of all boys and
the number of committees consisting of all girls.

There are C(5,4) = 5 committes of all boys.  (5 ways to leave one boy out)

There is C(4,4) = 1 committee of all girls.  (1 way to choose all 4 girls)

Answer 126 - 5 - 1 = 120 ways.

Edwin</pre>