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 1/6 and the probability that it will be green is 1/5. What is the probability that the marble will be either red or blue? Options:
A) 3/5
B) 7/15
C) 11/15
D) 19/30
E) 23/30
P(red or blue) = 1 - P(white) - P(green) = 30/30 - 5/30 - 6/30 = 19/30   The answer is 19/30.
<result>D</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 1/6 and the probability that it will be green is 1/5. What is the probability that the marble will be either red or blue?