#997 · Algebra · Sequences & series
Sum of a geometric series
Find the sum of the first 7 terms of the geometric progression .
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. V. Geometrical Progression, Examples V.a, No. 1
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).