An arithmetic series with first term $a$ and common difference $d$ is —

Question

Accepted Answer

$a + (a + d) + (a + 2d) + \cdots$

Answer

$a + ar + ar^{2} + \cdots$

Answer

$a + ad + ad^{2} + \cdots$

Answer

$a \cdot (a + d) \cdot (a + 2d) \cdots$

An arithmetic series with first term aaa and common difference ddd is —