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Home > PC > Chapter 7 > Lesson 7.3.2 > Problem 7-107

7-107.

Multiply S by 3 and ADD the two series. What happens?

S = 1 − 3 + 9 − 27 + 81 − 243 + 729 − 2187
3S = + 3− 9 + 27 − 81 + 243 − 729 + 2187 − 6561

So…
3S + S = + 1 − 6561
4S = −6560

S = −1640