There is a total of 84 marbles in a box, each of which is red, green, blue, or white. If one marble is drawn from the box at random, the probability that it will be white is 1/4 and the probability that it will be green is 1/7. What is the probability that the marble will be either red or blue?  Choose the correct choice from the following choices:  A) 4/7  B) 9/14  C) 11/14  D) 17/28  E) 23/28
P(red or blue) = 1 - P(white) - P(green) = 28/28 - 7/28 - 4/28 = 17/28   The answer is 17/28.
<result>D</result>
There is a total of 84 marbles in a box, each of which is red, green, blue, or white. If one marble is drawn from the box at random, the probability that it will be white is 1/4 and the probability that it will be green is 1/7. What is the probability that the marble will be either red or blue?