Pyramid Investigations 5 – Fifty Tall

Algebra Level 1

What is the value of the expression:

1+2+3++49+50+49++3+2+1? 1 + 2 + 3 + \dots + 49 + 50 + 49 + \dots + 3 + 2 + 1?

This problem is part of the Pyramid Investigations Set.
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