#1065 · Algebra · Sequences & series
Square pyramidal cannonballs
A square pyramid of cannonballs has 15 balls along each edge of the square 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. 1
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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).