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IKMC 2010 - Grades 9-10 - Self-study Question 23

IKMC · IKMC 2010 - Grades 9-10 - Self-study

Question 23

For how many integers $1\le n\le100$ is $n^n$ a square?
  1. 5
  2. 50
  3. 55
  4. 54
  5. 15