Final answer:
The formula for the sum of an arithmetic series is (n/2)(a + l), where n is the number of terms, a is the first term, and l is the last term.
Step-by-step explanation:
The formula for the sum of an arithmetic series is:
S = (n/2)(a + l)
- S: The sum of the series
- n: The number of terms in the series
- a: The first term of the series
- l: The last term of the series
For example, if you have an arithmetic series with 5 terms, starting from 1 and increasing by 2 each time, the sum would be:
S = (5/2)(1 + 9) = 5 x 10 = 50