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Magoosh - 数学PS - 288
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?
  • A$$\frac{9}{20}$$
  • B$$\frac{3}{5}$$
  • C$$\frac{3}{4}$$
  • D$$\frac{4}{5}$$
  • E1
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正确答案: B

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