diff --git a/01_challenge/01_challenge.py b/01_challenge/01_challenge.py
index 2d40fa5..f68bac4 100644
--- a/01_challenge/01_challenge.py
+++ b/01_challenge/01_challenge.py
@@ -14,17 +14,20 @@ def fizzbuzz(max_num):
     
     # adding some redundant declarations on purpose
     # we will make our script 'tighter' in one of coming exercises
-    three_mul = 'fizz'
-    five_mul = 'buzz'
+    three_mul = 'GCEM'
+    five_mul = 'CSE DEPT'
     num1 = 3
     num2 = 5 
 
     # Google for 'range in python' to see what it does
-    for i in range(1,max_num):
-        # % or modulo division gives you the remainder 
+    for i in range(1,max_num+1):
+        # % or modulo division gives you the remainder
+        print(max_num,i) 
+        if (i>0):
+            print("I am inside i")
         if i%num1==0 and i%num2==0:
             print(i,three_mul+five_mul)
-        elif i%num1=0:
+        elif i%num1==0:
             print(i,three_mul)
         elif i%num2==0:
             print(i,five_mul)
diff --git a/02_challenge/02_challenge.py b/02_challenge/02_challenge.py
index b41cd50..7513999 100644
--- a/02_challenge/02_challenge.py
+++ b/02_challenge/02_challenge.py
@@ -23,4 +23,4 @@ def fizzbuzz(max_num):
 
 #----START OF SCRIPT
 if __name__=='__main__':
-    fizzbuzz()
+    fizzbuzz(100)
diff --git a/03_challenge/03_challenge.py b/03_challenge/03_challenge.py
index 6e67d1f..2e4cd35 100644
--- a/03_challenge/03_challenge.py
+++ b/03_challenge/03_challenge.py
@@ -23,4 +23,4 @@ def fizzbuzz(max_num):
 
 #----START OF SCRIPT
 if __name__=='__main__':
-    fizzbuzz('16')
+    fizzbuzz(16)
diff --git a/04_challenge/04_challenge.py b/04_challenge/04_challenge.py
index a3f5edf..ff24e6c 100644
--- a/04_challenge/04_challenge.py
+++ b/04_challenge/04_challenge.py
@@ -23,7 +23,7 @@ def fizzbuzz(max_num):
     for i in range(1,max_num):
         # % or modulo division gives you the remainder 
         if i%num1==0 and i%num2==0:
-        print(i,three_mul+five_mul)
+          print(i,three_mul+five_mul)
         elif i%num1==0:
             print(i,three_mul)
         elif i%num2==0:
diff --git a/05_challenge/05_challenge.py b/05_challenge/05_challenge.py
index 0f9bdbd..2230348 100644
--- a/05_challenge/05_challenge.py
+++ b/05_challenge/05_challenge.py
@@ -17,11 +17,11 @@ def fizzbuzz(max_num):
     # we will make our script 'tighter' in one of coming exercises
     three_mul = 'fizz'
     five_mul = 'buzz'
-    with open('mifile.txt','r') as f:
-        print 'i have created'
-        num1 = int(f.readline())   
+    with open('myfile.txt','r') as f:
+        print('i have created')
+        num1 =int(f.readline())   
         num2=int(f.readline())        
-        max_num = int(f.readline())
+        max_num =int(f.readline())
          
     # Google for 'range in python' to see what it does
     for i in range(1,max_num):
diff --git a/06_challenge/06_challenge.py b/06_challenge/06_challenge.py
index b09e24e..d8d4483 100644
--- a/06_challenge/06_challenge.py
+++ b/06_challenge/06_challenge.py
@@ -18,7 +18,7 @@ def fizzbuzz(max_num):
     three_mul = 'fizz'
     five_mul = 'buzz'
     num1 = conf.num1
-    num2 = conf.num
+    num2 = conf.num2
     # Google for 'range in python' to see what it does
     for i in range(1,max_num):
         # % or modulo division gives you the remainder 
diff --git a/08_challenge/08_challenge.py b/08_challenge/08_challenge.py
index a7147d2..af18249 100644
--- a/08_challenge/08_challenge.py
+++ b/08_challenge/08_challenge.py
@@ -11,8 +11,8 @@
 
 class Fizz_Buzz:
     "Class to implement FizzBuzz for multiples of 3 and 5"
-
-    def fizzbuzz(max_num):
+  
+    def fizzbuzz(self,max_num):
         "This method implements FizzBuzz"
         
         # adding some redundant declarations on purpose
diff --git a/10_challenge/10_challenge.py b/10_challenge/10_challenge.py
index 7d1edf8..102d720 100644
--- a/10_challenge/10_challenge.py
+++ b/10_challenge/10_challenge.py
@@ -8,8 +8,8 @@
     # print buzz for multiples of 5 
     # print fizzbuzz for multiples of 3 and 5"
 """
-import fizzbuzz
+import fizzbuzz as fb
 
 #----START OF SCRIPT
 if __name__=='__main__':
-    fizzbuzz(100)
\ No newline at end of file
+    fb.fizzbuzz(100)
\ No newline at end of file
diff --git a/11_challenge/11_challenge.py b/11_challenge/11_challenge.py
index 123d406..2c07c45 100644
--- a/11_challenge/11_challenge.py
+++ b/11_challenge/11_challenge.py
@@ -14,12 +14,14 @@ def fizzbuzz(max_num):
     # Google for 'range in python' to see what it does
     for i in range(1,max_num):
         # % or modulo division gives you the remainder 
-        if i%3==0:
+        if i%3==0 and i%5==0:
+            print(i,"fizzbuzz")
+        elif i%3==0:
             print(i,"fizz")
         elif i%5==0:
             print(i,"Buzz")     
-        elif i%3==0 and i%5==0:
-            print(i,"fizzbuzz")
+        #elif i%3==0 and i%5==0:
+          #  print(i,"fizzbuzz")
 
 #----START OF SCRIPT
 if __name__=='__main__':
diff --git a/12_challenge/12_challenge.py b/12_challenge/12_challenge.py
index d8088be..1dc63d5 100644
--- a/12_challenge/12_challenge.py
+++ b/12_challenge/12_challenge.py
@@ -15,7 +15,7 @@ def __init__(self):
         # adding some redundant declarations on purpose
         # we will make our script 'tighter' in one of coming exercises
         self.num1 = 3
-        self.num2 = 4
+        self.num2 = 5
         self.three_mul = 'fizz'
         self.five_mul = 'buzz'
 
diff --git a/13_challenge/13_challenge.py b/13_challenge/13_challenge.py
index e7828f6..f856397 100644
--- a/13_challenge/13_challenge.py
+++ b/13_challenge/13_challenge.py
@@ -14,13 +14,13 @@ def fizzbuzz(max_num):
     
     # adding some redundant declarations on purpose
     # we will make our script 'tighter' in one of coming exercises
-    three_mul = 'fizz
+    three_mul = 'fizz'
     five_mul = 'buzz'
     num1 = 3
     num2 = 5 
 
     # Google for 'range in python' to see what it does
-    for i in range(1,max_num)
+    for i in range(1,max_num):
         # % or modulo division gives you the remainder 
         if i%num1==0 and i%num2==0:
             print(i,three_mul+five_mul)
@@ -31,4 +31,4 @@ def fizzbuzz(max_num):
 
 #----START OF SCRIPT
 if __name__=='__main__':
-    fizzbuzzy(100)
+    fizzbuzz(100)