**Arithmetic Series**

A series such as *a*_{1}, the common difference is *d*, and the number of terms is *n*. The sum of an arithmetic series is found by multiplying the number of terms times the average of the first and last terms.

Formula: | or |

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Example: | 3 + 7 + 11 + 15 + ··· + 99 has We solve 3 + ( or |

**See also**

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