If \(\sum_{r=1}^{10} r(r-1)^{10} C_r=k \cdot 2^9\), then \(k\) is equal to....

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If \(\sum_{r=1}^{10} r(r-1)^{10} C_r=k \cdot 2^9\), then \(k\) is equal to 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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