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@@ -15,6 +15,6 @@ Somme d'une [[suite arithmétique]] de raison $r$
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$\sum\limits_{k=0}^{n} k \times r = ?$
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?
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$r \dfrac{n(n+1)}{2}$
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<!--SR:!2023-09-04,32,250-->
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<!--SR:!2024-09-07,312,270-->
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