diff --git a/education/software development/ECE1400/Chapter 13 Exercises.md b/education/software development/ECE1400/Chapter 13 Exercises.md
index eeb7f51..62bec4f 100644
--- a/education/software development/ECE1400/Chapter 13 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 13 Exercises.md	
@@ -1,3 +1,5 @@
 > 1. The following function calls supposedly write a single new-line character, but some are incorrect. Identify which calls don't work and explain why.
 
-b. `printf("%c", "\n");` - This is
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+b. `printf("%c", "\n");` - This is invalid because the double quotes make `\n` a string, but it's being displayed with the `%c`formatting specifier.
+c. `printf(%s, '\n');` - This is invalid because it's trying to display a `char` using the string formatting specifier.
+e. `printf('\n'`
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