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2019 AMC 12B Question 2

AMC12 · 2019 AMC 12B

Question 2

Consider the statement, “If $n$ is not prime, then $n-2$ is prime.” Which of the following values of $n$ is a counterexample to this statement?
  1. $11$
  2. $15$
  3. $19$
  4. $21$
  5. $27$