Find the number of shots arranged in a complete pyramid the base of which is an equilateral tria....

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Find the number of shots arranged in a complete
\( \mathrm{P} \)
pyramid the base of which is an equilateral triangle, each side containing \( n \) shots.
(1) \( n(n+1)(n+2) / 3 \)
(2) \( n(n+1)(n+2) / 6 \)
(3) \( n(n+2) / 6 \)
(4) \( (n+1)(n+2) / 6 \)


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