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IKMC 2015 - Grades 9-10 - Self-study Question 20

IKMC · IKMC 2015 - Grades 9-10 - Self-study

Question 20

Which is a counterexample to: “If n is prime, exactly one of n−2 and n+2 is prime”?
  1. n=11
  2. n=19
  3. n=21
  4. n=29
  5. n=37