|
A similar
formula works for when the terms skip some numbers, like
Here's the
formula:
| To find the
sum of the first
n
terms:
|
Here's how I
remember it:
* This is for
arithmetic sequences ONLY!
Let's try it!
Let's find
the sum of the first
50
terms of the arithmetic sequence:
We have:
We need:
Continued on the
next
page
|
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