Question
The formula $S_{n}=\frac{n}{2}\left(a_{1}+a_{n}\right)$ can be used to find the sum of the first $n$ terms of an arithmetic sequence, called the ____________.
Step 1
Step 1: The given formula is $S_{n}=\frac{n}{2}\left(a_{1}+a_{n}\right)$, where $S_{n}$ is the sum of the first $n$ terms of an arithmetic sequence, $n$ is the number of terms, $a_{1}$ is the first term and $a_{n}$ is the last term. Show more…
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