Arithmetic Sequences
Add same number each time.
\(n\text{th term} = a + (n - 1)d\)
Example
3, 5, 7, 9,... has common difference 2.
→ nth term = 3 + (n - 1)×2 = 2n + 1
Practice
In 3, 5, 7, 9, ... what is the 10th term?
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