单选题A jar contains 4 red, 1 green, and 3 yellow marbles. If 2 marbles are drawn from the jar without replacement, what is the probability that both will be yellow?A3/8B3/28C1/4D3/56E5/56
单选题
A jar contains 4 red, 1 green, and 3 yellow marbles. If 2 marbles are drawn from the jar without replacement, what is the probability that both will be yellow?
A
3/8
B
3/28
C
1/4
D
3/56
E
5/56
参考解析
解析：
There are eight marbles in the jar. The probability of choosing the first yellow marble is 3/8. The probability that your second marble will also be yellow is 2/7. The probability that both will be yellow is 3/8×2/7=6/56=3/28.
There are eight marbles in the jar. The probability of choosing the first yellow marble is 3/8. The probability that your second marble will also be yellow is 2/7. The probability that both will be yellow is 3/8×2/7=6/56=3/28.
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