A bag contains 5 white balls, 4 black balls, and 3 red balls. One by one, three balls are drawn out without replacement. What is the probability that the third ball is red? Choices
A) 1/2	B) 1/4	C) 3/8	D) 5/16	E) 2/5
The probability for each ball to be drawn third is equal.   Then the probability a red ball is drawn third is 3/12 = 1/4.   The answer is 1/4.
<result>B</result>
A bag contains 5 white balls, 4 black balls, and 3 red balls. One by one, three balls are drawn out without replacement. What is the probability that the third ball is red?