diff --git a/education/software development/ECE1400/Chapter 4 Exercises.md b/education/software development/ECE1400/Chapter 4 Exercises.md
index f729974..baa68b5 100644
--- a/education/software development/ECE1400/Chapter 4 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 4 Exercises.md	
@@ -1,7 +1,9 @@
 # 1.
 a. `1 2`
-
+b. `0`
+c. 
 # 3.
+
 # 9.
 # 11.
 # 15.