diff --git a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/entropy/n1/20.figures/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/entropy/n1/20.figures/cheatsheet.fr.md
index 64935c082..8babd2706 100644
--- a/00.brainstorming-pedagogical-teams/45.synthesis-structuring/entropy/n1/20.figures/cheatsheet.fr.md
+++ b/00.brainstorming-pedagogical-teams/45.synthesis-structuring/entropy/n1/20.figures/cheatsheet.fr.md
@@ -83,7 +83,7 @@ C'est *un peu plus que* **dix-huit milliards de milliard de grains de riz**.
 !!
 !! Tu peux maintenant comparer les équations $`(equ.1)`$ et $`(equ.2)`$, et remarquer que 
 !!
-!! $`2 + 2^2 + 2^3 + 2^4 + \,.\,.\,. + 2^{63} + 2^{64}`$$`\; = (1 + 2^1 + 2^2 + 2^3 +\,.\,.\,. + 2^{62} + 2^{63}`$$`\;-1+2^{64}`$
+!! $`2 + 2^2 + 2^3 + 2^4 + \,.\,.\,. + 2^{63} + 2^{64}`$$`\; = (1 + 2^1 + 2^2 + 2^3 +\,.\,.\,. + 2^{62} + 2^{63})`$$`\;-1+2^{64}`$
 !!
 !! donc $`N \times 2 = N - 1 + 2^{64}`$
 !!