Pyramid Investigations 6 – Reversing The Pyramid

Algebra Level 1

What is the value of \( n \) in the following expression?

\[ 1 + 2 + 3 + \dots + (n-1) + n + (n-1) + \dots + 3 + 2 + 1 = 289 \]


Image Credit: Ricardo Liberato, CC SA 2.0
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