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3.11 Exercise 5

Avg difficulty 2.5

What is the sum of the first 13 terms of the geometric sequence with first term $a_{1} = 5$ and common ratio $r = 3$ ?
What is the sum of the first 7 terms of the geometric sequence with first term $a_{1} = 16$ and common ratio $r = \frac{1}{8}$ ?

OpenStax Contemporary Mathematics, 3.11 Geometric Sequences, exercise 5

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