A bag contains 12 marbles:5 marbles are orange.3 are blue,and the rest are red . If one marble is selected at random from the bag,what is the probability that it will be red or blue?
There are a total of 5 + 3 + (12 - 5 - 3) = 9 red or blue marbles in the bag. Therefore, the probability of selecting a red or blue marble at random is:
P(red or blue) = (number of red or blue marbles) / (total number of marbles)
P(red or blue) = 9 / 12
P(red or blue) = 0.75 or 75%
Therefore, there is a 75% chance that a randomly selected marble will be red or blue.