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单选题
A bag contains three green marbles, four blue marbles, and two orange marbles. If a marble is picked at random, what is the probability that an orange marble will NOT be picked?
A
1/4
B
1/3
C
4/11
D
1/2
E
9/7
参考答案
参考解析
解析：
The total number of marbles in the bag is 3+4+2 or 9. Of these 9 marbles, 3+4 or 7 marbles are not orange. Hence, the probability that an orange marble will NOT be picked is 7/9.
The total number of marbles in the bag is 3+4+2 or 9. Of these 9 marbles, 3+4 or 7 marbles are not orange. Hence, the probability that an orange marble will NOT be picked is 7/9.
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