diff --git a/education/software development/ECE1400/Chapter 4 Exercises.md b/education/software development/ECE1400/Chapter 4 Exercises.md
index 18221ac..278f29c 100644
--- a/education/software development/ECE1400/Chapter 4 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 4 Exercises.md	
@@ -17,6 +17,6 @@ d. `0 0 0`
 a. `0 2`
 b. `4 11 6`
 c. `0 8 7`
-d. ``
+d. `15 4 5 4`
 
 # 15.