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#flashcards/maths/calculus
----
# Formules de somme
Somme d'une [[suite géométrique]] de raison $q$
$\sum\limits_{k=0}^{n}q^{k} = ?$
?
$\dfrac{1-q^{n}}{1-q}$
<!--SR:!2024-07-17,390,250-->
Somme d'une [[suite arithmétique]] de raison $r$
$\sum\limits_{k=0}^{n} k \times r = ?$
?
$r \dfrac{n(n+1)}{2}$
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