#1072 · Algebra · Sequences & series
Complete rectangular pile
A complete rectangular pile of shot has 15 layers (courses). The longer side of its base contains 20 shot. Assuming the numbers of shot in successive layers form a harmonic progression, determine the total number of shot in the pile.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VI. Harmonical Progression, Examples VI.b, No. 8
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).