#1014 · Algebra · Sequences & series
Common ratio from partial sums
The sum of the first six terms of a geometric progression is nine times the sum of its first three terms. Find the common ratio.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. V. Geometrical Progression, Examples V.a, No. 20
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).