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Counting & Binomials
Review question
Can we sum $r(r+1)(r+3)$ for $r$ from $1$ to $n$?
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Ref: R5246
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Question
Evaluate:
\(\sum_{r=1}^{n}r(r+1)(r+3)\)
;
\(\sum_{r=1}^n \dfrac{1}{r(r+1)(r+3)}\)
.
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