Pyramid Investigations 2 – Consecutive Number Pyramids

Algebra Level 1

Using the pattern above as an aid, evaluate the sum:

1+2+3+4+5+4+3+2+1 1 + 2 + 3 + 4 + 5 + 4 + 3 + 2 + 1

This problem is part of the Pyramid Investigations Set.
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