Answer
$a_n = a_1 + (n - 1)d$, where $a_1$ is the first term and $d$ is the common difference.
Explanation
The sum of the first $n$ terms is $S_n = \frac{n}{2}(a_1 + a_n)$.
Home / Library / ACT Mastery: English, Math, Reading & Science / Synthetic flashcard
What is the formula for the $n$-th term of an arithmetic sequence, and what do the symbols represent?
Study flashcard from the deck ACT Mastery: English, Math, Reading & Science.