If \( \sum_{r=0}^{n} \frac{2 r}{{ }^{n} C_{r}}=\sum_{r=0}^{n} \frac{n^{2}-3 n+3}{{ }^{n} C_{r}} ...

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If \( \sum_{r=0}^{n} \frac{2 r}{{ }^{n} C_{r}}=\sum_{r=0}^{n} \frac{n^{2}-3 n+3}{{ }^{n} C_{r}} \) then find \( \mathrm{n} \).
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