Wednesday, April 12, 2017

summation - Summing $r(r+3)$ using induction

We want to prove the following summation by induction:
$$\sum_{r=1}^{n}r(r+3)=\frac{1}{3}n(n+1)(n+5)$$
The problem is posted for a friend, but others can look at the solution if they want/need.

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