#1069 · Algebra · Sequences & series
Incomplete square pyramid with given courses
An incomplete square pyramid consists of 27 layers (courses) and has 40 balls along each edge of the base. Find the total number of balls in the pyramid.
H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. VI. Harmonical Progression, Examples VI.b, No. 5
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).