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9-44.

Determine whether each of the following infinite series converges or diverges. Explain each answer briefly. If the series converges, calculate its exact sum. Homework Help ✎

  1. What is 1 + 1 + 1 + 1 + ... ?

  1. This is a geometric sequence with a ratio of 3/4.

  1. This is also a geometric sequence. What is the ratio? (See part (b).)

  1. This can be written as a telescoping sum: