There is a total of 90 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 1/3 and the probability that it will be green is 1/5. What is the probability that the marble will be either red or blue?  Choose the correct option.
A) 1/3
B) 3/5
C) 7/15
D) 11/30
E) 17/30
P(red or blue) = 1 - P(white) - P(green) = 15/15 - 5/15 - 3/15 = 7/15   The answer is 7/15.
<result>C</result>
There is a total of 90 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 1/3 and the probability that it will be green is 1/5. What is the probability that the marble will be either red or blue?