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https://matheducators.stackexchange.com/questions/30152/teaching-arithmetic-sum-formula
algebra - Teaching arithmetic sum formula - Mathematics Educators Stack Exchange
I am trying to teach my student the formula $$ 1 + 2 + \dots + n = \frac{n(n+1)}{2} $$ for $n \in \mathbb{N}$ with a visual model like the following one, so...
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