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1952 AMC 12 Question 26

AMC12 · 1952 AMC 12

Question 26

If $\left(r+\dfrac1r\right)^2=3,$ then $r^3+\dfrac1{r^3}$ equals
  1. $1$
  2. $2$
  3. $0$
  4. $3$
  5. $6$