Question
Explain how to find a particular term in a binomial expansion without having to write out the entire expansion.
Step 1
The binomial theorem states that $(a+b)^n = \sum_{r=0}^{n} \left(\begin{array}{l}n \\ r\end{array}\right) a^{n-r} b^{r}$, where $\left(\begin{array}{l}n \\ r\end{array}\right)$ is the binomial coefficient. Show more…
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