The probability of selecting a green marble is 2/12 and the probability of selecting a blue marble is 4/12. Therefore, the total probability of selecting a green or blue marble is:
2/12 + 4/12 = 6/12 = 1/2
So, the probability that Sarah will select either a green or blue marble is 1/2.
Sarah has a bag of marbles containing 6 red, 4 blue, and 2 green marbles. If she randomly selects one marble, what is the probability that it will be either green or blue?
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3/6
5/12
1/3
2/3
1 answer