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Home > PC > Chapter 7 > Lesson 7.3.2 > Problem 7-108

7-108.

400 = 20 + 40an

380 = 40an

95 = an

Series = 5 + 35 + 65 + 95

200 = 5(r + 1)(r2 + 1)

By inspection = 3.

Series = 5 + 15 + 45 + 135