diff --git a/is/UB1/ISUB1.tex b/is/UB1/ISUB1.tex
index 1f51ce3..f473add 100644
--- a/is/UB1/ISUB1.tex
+++ b/is/UB1/ISUB1.tex
@@ -89,17 +89,17 @@
             \item hands with exaclty two pairs: ${13\choose 2}{4\choose 2}^2\cdot 11\cdot 4=123552$\\
             $\mathds{P}(2\ pairs)=\frac{123552}{2598960}=\frac{198}{4165}\approx 0.0475$
             \item \begin{enumerate}[(a)]
-                \item hands with exaclty two pairs without spades: ${13\choose 2}{3\choose 2}^2\cdot 11\cdot 3=23166$\\
-                possible hands ${39 \choose 5} = 575757$\\
-                $\mathds{P}(2\ pairs|\neg Spades)=\frac{23166}{575757}=\frac{198}{4921}\approx 0.04023$\\
+                \item possible hands without Spades: ${39\choose 5}=575757$\\
+                hands with exaclty two pairs without Spades: ${13\choose 2}{3\choose 2}^2\cdot 11\cdot 3=23166$\\
+                $\mathds{P}(2\ pairs|\neg Spades)=\frac{23166}{575757}=\frac{168}{4921}\approx 0.0402$\\
                 one pair:\\
                 ${13\choose 1}{3\choose 2}{12 \choose 3}\cdot 3^3=231660$\\
-                $\mathds{P}(1\ pair|\neg Spades)=\frac{231660}{575757}=\frac{1980}{4921}\approx 0.40235$
+                $\mathds{P}(1\ pair|\neg Spades)=\frac{231660}{575757}=\frac{1980}{4921}\approx 0.402$
                 \item $A:=2\ pairs,\ B:=\neg Spades$\\
                 $P(A|B)=\frac{P(B|A)P(A)}{P(B)}$\\
                 $P(A)=\frac{198}{4165},\ P(B)=\frac{39}{52}\cdot\frac{38}{51}\cdot\frac{37}{50}\cdot\frac{36}{49}\cdot\frac{35}{48}=\frac{2109}{9520}$\\
                 $P(B|A)=1-P(\neg B| A)=1-\left(\frac{1}{4}+\frac{3}{4}\frac{1}{4}+\left(\frac{3}{4}\right)^2\frac{1}{4}+\left(\frac{3}{4}\right)^3\frac{1}{4}+\left(\frac{3}{4}\right)^4\frac{1}{3}\right)=1-\frac{101}{128}=\frac{27}{128}\approx 0.211$\\
-                $P(A|B)=\frac{\frac{27}{128}\cdot \frac{198}{4165}}{\frac{2109}{9520}}$%TODO
+                $P(A|B)=\frac{\frac{27}{128}\cdot \frac{198}{4165}}{\frac{2109}{9520}}=\frac{891}{19684}\approx 0.0452$%TODO
             \end{enumerate}
         \end{enumerate}
     \Aufgabe{Random Variables}{2+2+2=6}