Somme des termes d'une suite géométrique
On considère une suite géométrique de raison -3 telle que
u
1
=
−
21
. Calculer la somme
u
1
+
⋯
+
u
7
.
On a
S
=
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Abandon
Clicking on Abandon brings up a new statement from the same exercise; the work already done on this exercise is then lost.
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Robot trapper, do not go there!