diff --git a/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.pdf b/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.pdf
index 51a8ac8..9b18150 100644
Binary files a/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.pdf and b/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.pdf differ
diff --git a/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.tex b/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.tex
index 75fe744..9fe2235 100755
--- a/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.tex	
+++ b/TST_sti2d/Questions Flash/P2/QF_20_11_30-2.tex	
@@ -20,7 +20,7 @@
 \begin{frame}[fragile]{Calcul 1}
     On donne la formule suivante
     \[
-        \frac{1}{R} = \frac{1}{R_1} - \frac{1}{R_2} 
+        \frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2} 
     \]
     Exprimer $R_2$ en fonction des autres grandeurs.
     \[