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SMO 2018 Senior Round 1 Question 5

SMO · SMO 2018 Senior Round 1

Question 5

In the expansion of $\left(x^2+\frac 1 x\right)^9$, find the coefficient of $x^{15}$.
  1. $9$
  2. $36$
  3. $84$
  4. $126$
  5. None of the above