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2019 AMC 12A Question 13

AMC12 · 2019 AMC 12A

Question 13

How many ways are there to paint each of the integers $2,$ $3,$ $\ldots,$ $9$ either red, green, or blue so that each number has a different color from each of its proper divisors?
  1. $144$
  2. $216$
  3. $256$
  4. $384$
  5. $432$