Pyramid Investigations 4 – Pyramid Number Identity

Algebra Level 1

In the pattern

1+2+3++(n1)+n+(n1)++3+2+1, 1 + 2 + 3 + \dots + (n-1) + n + (n-1) + \dots + 3 + 2 + 1,

which of the following expressions represents the sum?

This problem is part of the Pyramid Investigations Set.
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