diff --git a/education/software development/ECE1400/Chapter 4 Exercises.md b/education/software development/ECE1400/Chapter 4 Exercises.md
index c1c9622..18221ac 100644
--- a/education/software development/ECE1400/Chapter 4 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 4 Exercises.md	
@@ -15,8 +15,8 @@ c. `0 1 3`
 d. `0 0 0`
 # 11.
 a. `0 2`
-b. 
-c. 
-d. 
+b. `4 11 6`
+c. `0 8 7`
+d. ``
 
 # 15.