4.9. a. In a geometric sequence explain why r is called the common ratio b. Identify a, r values for the geometric sequence: 18, -6,
4.9. a. In a geometric sequence explain why r is called the "common ratio" b. Identify a, r values for the geometric sequence: 18, -6, 2, - OIN F c. Find lim ar -1. Does this geometric sequence converge: Yes, or no
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