diff --git a/education/software development/ECE1400/Chapter 4 Exercises.md b/education/software development/ECE1400/Chapter 4 Exercises.md
index fb57aaa..c1c9622 100644
--- a/education/software development/ECE1400/Chapter 4 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 4 Exercises.md	
@@ -12,6 +12,11 @@ d. `1`, `2`
 a. `63 8`
 b. `1 2 3`
 c. `0 1 3`
-d. 
+d. `0 0 0`
 # 11.
+a. `0 2`
+b. 
+c. 
+d. 
+
 # 15.