--- a/sets.rst	Wed Oct 06 16:33:53 2010 +0530
+++ b/sets.rst	Thu Oct 07 10:07:22 2010 +0530
@@ -147,3 +147,94 @@
    Internal Reviewer 1 : 
    Internal Reviewer 2 : 
    External Reviewer   :
+
+
+Questions
+=========
+
+ 1. If ``a = [1, 1, 2, 3, 3, 5, 5, 8]``. What is set(a)
+
+   a. set([1, 1, 2, 3, 3, 5, 5, 8])
+   #. set([1, 2, 3, 5, 8])
+   #. set([1, 2, 3, 3, 5, 5])
+   #. Error
+
+   Answer: set([1, 2, 3, 5, 8])
+
+ 2. ``a = set([1, 3, 5])``. How do you find the length of a?
+
+   Answer: len(a)
+
+ 3. ``a = set([1, 3, 5])``. What does a[2] produce?
+
+   a. 1
+   #. 3
+   #. 5
+   #. Error
+
+   Answer: Error
+
+ 4. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What
+    is the value of ``odd | squares``?
+
+   Answer: set([1, 3, 4, 5, 7, 9, 16])
+
+ 5. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What
+    is the value of ``odd - squares``?
+
+   Answer: set([3, 5, 7])
+
+ 6. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What
+    is the value of ``odd ^ squares``?
+
+   Answer: set([3, 4, 5, 7, 16])
+
+ 7. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What
+    does ``odd * squares`` give?
+
+   a. set([1, 12, 45, 112, 9])
+   #. set([1, 3, 4, 5, 7, 9, 16])
+   #. set([])
+   #. Error
+
+   Answer: Error
+
+ 8. ``a = set([1, 2, 3, 4])`` and ``b = set([5, 6, 7, 8])``. What is ``a + b``
+
+   a. set([1, 2, 3, 4, 5, 6, 7, 8])
+   #. set([6, 8, 10, 12])
+   #. set([5, 12, 21, 32])
+   #. Error
+
+ 9. ``a`` is a set. how do you check if if a varaible ``b`` exists in ``a``?
+
+   Answer: b in a
+
+ 10. ``a`` and ``b`` are two sets. What is ``a ^ b == (a - b) | (b - a)``?
+
+   a. True
+   #. False
+
+   Answer: False
+
+
+Problems
+========
+
+ 1. Given that mat_marks is a list of maths marks of a class. Find out the
+    no.of duplicates marks in the list.
+
+   Answer::
+
+     unique_marks = set(mat_marks)
+     no_of_duplicates = len(mat_marks) - len(unique_marks)
+
+ 2. Given that mat_marks is a list of maths marks of a class. Find how many
+    duplicates of each mark exist.
+
+   Answer::
+
+     marks_set = set(mat_marks)
+     for mark in marks_set:
+         occurences = mat_marks.count(mark)
+         print occurences - 1, "duplicates of", mark, "exist"