Pyramid Investigations 3 – High Rise Pyramid Number

Algebra Level 1

Evaluate:

1+2+3+⋯+8+9+8+⋯+3+2+1. 1 + 2 + 3 + \dots + 8 + 9 + 8 + \dots + 3 + 2 + 1.

This problem is part of the Pyramid Investigations Set.
Arron Kau by Arron Kau
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