diff --git a/11_Day_Functions/11_functions.md b/11_Day_Functions/11_functions.md
index 3e413f8..cbfe621 100644
--- a/11_Day_Functions/11_functions.md
+++ b/11_Day_Functions/11_functions.md
@@ -403,7 +403,7 @@ Generally avoid this unless required as it makes it harder to understand what th
 ```py
 #You can pass functions around as parameters
 def square_number (n):
-    return n * n
+    return n ** n
 def do_something(f, x):
     return f(x)
 print(do_something(square_number, 3)) # 9
diff --git a/13_Day_List_comprehension/13_list_comprehension.md b/13_Day_List_comprehension/13_list_comprehension.md
index 5e5810b..df44d92 100644
--- a/13_Day_List_comprehension/13_list_comprehension.md
+++ b/13_Day_List_comprehension/13_list_comprehension.md
@@ -92,7 +92,7 @@ numbers = [-8, -7, -3, -1, 0, 1, 3, 4, 5, 7, 6, 8, 10]
 positive_even_numbers = [i for i in numbers if i % 2 == 0 and i > 0]
 print(positive_even_numbers)                    # [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
 
-# Flattening a three dimensional array
+# Flattening a two dimensional array
 list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
 flattened_list = [ number for row in list_of_lists for number in row]
 print(flattened_list)    # [1, 2, 3, 4, 5, 6, 7, 8, 9]
diff --git a/15_Day_Python_type_errors/15_python_type_errors.md b/15_Day_Python_type_errors/15_python_type_errors.md
index 949cc1f..93b6543 100644
--- a/15_Day_Python_type_errors/15_python_type_errors.md
+++ b/15_Day_Python_type_errors/15_python_type_errors.md
@@ -348,7 +348,7 @@ ZeroDivisionError: division by zero
 We cannot divide a number by zero.
 
 We have covered some of the python error types, if you want to check more about it check the python documentation about python error types.
-If you are good at reading the error types then you will be able to fix your bugs fast and you will also become a better programmer.
+If you are good at reading the error types, then you will be able to fix your bugs fast and you will also become a better programmer.
 
 🌕 You are excelling. You made it to half way to your way to greatness. Now do some exercises for your brain and for your muscle.