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OpenStudy (cartoon_horses):
Marsha has a bag that contains 4 green marbles, 8 yellow marbles, and 20 red marbles. If she chooses one marble from the bag, what is the probability that the marble is not red?
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OpenStudy (robtobey2):
1-(20/32)
OpenStudy (mariamikayla):
probability=number of favorable cases/number of possible cases the number of favorable cases is obtain by adding the number of green marbles with the number of yellow marbles number of favorable cases : 4+8=12 number of possible casses is the sum of all marbles: 4+8+20=32 probability=12/32= 3/8
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