GMAT 考满分题库

- 数学PS -
A "Sophie Germain" prime is any positive prime number p for which 2p + 1 is also prime. The product of all the possible units digits of Sophie Germain primes greater than 5 is
  • A3
  • B7
  • C21
  • D27
  • E189
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正确答案: D

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