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10-9.
  1. For each of the following series, decide if there is a finite sum. Then predict the sum. If there is not a finite sum, explain why. Homework Help ✎

    1. 5 + 10 + 15 + 20 + …

    2. 0.1 + 0.01 + 0.001 + 0.0001 + …

    3. 2 − 2 + 2 − 2 + …

For an infinite geometric series:

But r must be _____.

The series in part (a) is arithmetic.
The other series are geometric. What is the value of r in each case?