题目信息
A: {71,73,79,83,87} B:{57,59,61,67}
If one number is selected at random from set A, and one number is selected at random from set B, what is the probability that both numbers are prime?
If one number is selected at random from set A, and one number is selected at random from set B, what is the probability that both numbers are prime?
A:$$\frac{9}{20}$$
B:$$\frac{3}{5}$$
C:$$\frac{3}{4}$$
D:$$\frac{4}{5}$$
E:1
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正确答案：
B:$$\frac{3}{5}$$
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