Infinite arithmetico–geometric series (Sum of (a+kd)r^k from k=0 to ∞ equals a/(1−r) + dr/(1−r)² when |r|<1)
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Sum of (a+kd)r^k from k=0 to ∞ equals a/(1−r) + dr/(1−r)² when |r|<1
What each symbol means
| Symbol | What it stands for |
|---|---|
| r | Ratio |
| a,d | AP parameters |
When to use this
|r|<1 for convergence.