diff --git a/education/software development/ECE1400/Chapter 11 Exercises.md b/education/software development/ECE1400/Chapter 11 Exercises.md
index e032e2a..f81b663 100644
--- a/education/software development/ECE1400/Chapter 11 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 11 Exercises.md	
@@ -9,7 +9,12 @@
 ```c
 middle = (low + high) / 2
 ```
-The above statement is illegal because you can't add an `int *` to an `int *`. It can be made legal by casting `low` and `high` to numbers, performing the operation, then casting to a pointer.
+The above statement is illegal because you can't add an `int *` to an `int *`. The below operation is legal because you can perform pointer subtraction, and because `low` is defined on the left hand side of the equation, then adding a long to a pointer is valid.
 ```c
-middle = (int*) (((long) low + (long) high) / 2);
+middle = low + (high - low) / 2;
+```
+
+3. What will be the contents of the `a` array after the following statements are executed?
+```c
+{1}
 ```
\ No newline at end of file