A bag contains 6 white balls, 7 black balls, and 7 red balls. One by one, three balls are drawn out without replacement. What is the probability that the third ball is red?
Select the correct option:
A) 0.25 B) 0.15 C) 0.35 D) 0.45 E) 0.4
Each ball has an equal probability of being the third ball drawn.   P(3rd ball is red) = 7/20= 
<gadget id="calculator">7/20</gadget>
<output>7/20 = around 0.35</output>
0.35   The answer is 0.35.
<result>C</result>
A bag contains 6 white balls, 7 black balls, and 7 red balls. One by one, three balls are drawn out without replacement. What is the probability that the third ball is red?