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AMO 2022 – Secondary 3 (Grade 9) Question 2

AMO · AMO 2022 – Secondary 3 (Grade 9)

Question 2

Let $T_n=1+2+\cdots+n$, where n is a positive integer. What is $\sqrt{8T_n+1}$?

Question illustration
  1. $n-1$
  2. $n+1$
  3. $2n+1$
  4. $2n-1$
  5. $3n+1$