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Australian AMC 2014 - Senior Question 13

AMC AUSTRALIA · Australian AMC 2014 - Senior

Question 13

Between which two numbers does $\sqrt{1+2+3+\cdots+99+100}$ lie?
  1. 14 and 15
  2. 25 and 26
  3. 30 and 31
  4. 71 and 72
  5. 100 and 101