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Australian AMC 2020 - Intermediate Question 19

AMC AUSTRALIA · Australian AMC 2020 - Intermediate

Question 19

The number $\dfrac{1\times2\times3\times4\times5\times6\times7\times8\times9\times10}{n}$ is a perfect square.
What is the smallest possible value of $n$?
  1. 7
  2. 14
  3. 21
  4. 35
  5. 70