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Home > A2C > Chapter 2 > Lesson 2.2.3 > Problem 2-153

2-153.

Find the formula for for the arithmetic sequence in which and .

Visualize the sequences as two points on a graph, and .

Finding the common difference is the same as finding the constant rate of change of a line, the slope.

Use the slope or common difference and one of the points, say to substitute into . And solve: