Math 20-1: Arithmetic Series

1. Introduction: 00:04
2. Formulas: 00:46
3. Examples - In an arithmetic series, determine:
a) the sum of the terms if the last term is unknown: 03:22
b) the sum of the terms if the last term is known: 04:49
c) the value of terms (and the sum of a given number terms) given the sum of two series: 07:50