--- a/day1/Session-4.tex	Thu Oct 08 15:42:43 2009 +0530
+++ b/day1/Session-4.tex	Thu Oct 08 16:16:58 2009 +0530
@@ -191,8 +191,8 @@
 \begin{frame}
   \frametitle{Problem set 6.2}
   \begin{description}
-    \item[2.2.1] Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these?
-    \item[2.2.2] Given a string of the form ``4-7, 9, 12, 15'' find the numbers missing in this list for a given range.
+    \item[6.2.1] Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these?
+    \item[6.2.2] Given a string of the form ``4-7, 9, 12, 15'' find the numbers missing in this list for a given range.
 \end{description}
 \inctime{10}
 \end{frame}