PLEASE HELP WILL MEDAL (ans. must be correct)

The nth pyramidal number tells how many cannonballs there are in a square arrangement that is n cannonballs high.

true or false

Question

PLEASE HELP WILL MEDAL (ans. must be correct)

The nth pyramidal number tells how many cannonballs there are in a square arrangement that is n cannonballs high.

true or false

anonymous · Answer

If it's a square pyramid, then yes. 
If it's a triangular pyramid, such as you get in the fourth diagonal of Pascal's triangle, then, no. And I believe this is the usual meaning when the type of pyramid is unspecified.

anonymous · Answer

ill go with yes then