SOLUTION: 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?

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?
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!
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?

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

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