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IKMC 2021 - Grades 11-12 - Set 2 - Self-study Question 2

IKMC · IKMC 2021 - Grades 11-12 - Set 2 - Self-study

Question 2

How many integers lie in the open interval $(20-\sqrt{21},20+\sqrt{21})$?
  1. 9
  2. 10
  3. 11
  4. 12
  5. 13