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1987 AMC 8 Question 20

AMC8 · 1987 AMC 8

Question 20

Consider the statement: “If a whole number $n$ is not prime, then the whole number $n - 2$ is not prime.” Which of the following values of $n$ shows this statement to be false?
  1. $9$
  2. $12$
  3. $13$
  4. $16$
  5. $23$