If \( C_{r} \) stands for \( { }^{n} C_{r} \), then the sum of the series
\[
\frac{2\left(\frac{... VIDEO
If \( C_{r} \) stands for \( { }^{n} C_{r} \), then the sum of the serieshttps://bit.ly/YTAI_PWAP https://www.pw.live
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