1. This document provides examples and definitions related to arithmetic and geometric progressions. It defines arithmetic and geometric progressions and gives formulas for finding individual terms and summing the total terms. 2. Key examples show how to pair terms in an arithmetic progression to simplify summing the total. It also illustrates summing fractions in a geometric progression as areas in a rectangle. 3. Formulas are provided for finding the k-th term and summing the total terms of an arithmetic or geometric progression, depending on whether the difference or ratio is constant between terms.