If \( D_{r}=\left|\begin{array}{ccc}2 r & 1 & n \\ 1 & -2 & 3 \\ 3 & 2 & 1\end{array}\right| \),... VIDEO
If \( D_{r}=\left|\begin{array}{ccc}2 r & 1 & n \\ 1 & -2 & 3 \\ 3 & 2 & 1\end{array}\right| \), then find the value of \( \sum_{r=1}^{n} D_{r} \)https://bit.ly/YTAI_PWAP https://www.pw.live
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