Question 1037302
Suppose there are 2 red balls, 5 blue balls, and 1 black 
ball. What’s the minimum number of balls you have to draw 
to ensure a blue ball is drawn?
<pre>
There are three balls that aren't blue.  The most extreme case is when 
you draw all three non-blue balls first. In that extreme case you must 
draw a blue ball on your fourth try.  Any other case you would have
already drawn a blue ball before your fourth try.  So the answer is 4.


Edwin</pre>