Question: Show that

1. \(\left(\begin{array}{c}n \\ r\end{array}\right)=\frac{n-r+1}{r} \cdot\left(\begin{array}{c}n \\ r-1\end{array}\right)\),
2. \(n\left(\begin{array}{c}n-1 \\ r\end{array}\right)=(r+1)\left(\begin{array}{c}n \\ r+1\end{array}\right)\);
3. What is the coefficient of \(x^{3}\) in \((6 x+5)^{7}\) when expanded?

Price: $2.99

Solution: The downloadable solution consists of 1 pages
Deliverable: Word Document