diff --git a/education/software development/ECE1400/Chapter 4 Exercises.md b/education/software development/ECE1400/Chapter 4 Exercises.md
index 2a52e33..015109d 100644
--- a/education/software development/ECE1400/Chapter 4 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 4 Exercises.md	
@@ -4,7 +4,8 @@ b. `0`
 c. `1`
 d. `0`
 # 3.
-
+a. `1`, `2`
+b. 
 
 # 9.
 # 11.