Question 117457
<pre><font face = "book antiqua" color = "indigo" size = 4><b>
A bag contains 10 blue, 6 red, and 4 green rubber balls. If you select a ball
at random from the bag, what is the probability of not choosing a green ball? 

A. 1/5 
B. 4/5
C. 5/6
D. 9/10 

To not choose a green ball means to select a non-green ball.  There are
16 non-green balls out of the 20. So the probability is 16/20 which reduces
to 4/5, so the correct answer is B.

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Why can you eliminate choice D in this question?

Because that's what the answer would be if there had been 10 blue, 8 red,
and 2 green rubber balls. 

Edwin</pre>