diff --git a/practice-exam/practice-exam-18.md b/practice-exam/practice-exam-18.md
index fcfdbec..c903b4d 100644
--- a/practice-exam/practice-exam-18.md
+++ b/practice-exam/practice-exam-18.md
@@ -457,7 +457,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: CE
+    Correct Answer: AC
 
     Explanation: <https://aws.amazon.com/lambda/pricing/>
 
@@ -647,7 +647,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: A
+    Correct Answer: D
 
     Explanation: <https://docs.aws.amazon.com/whitepapers/latest/aws-overview/six-advantages-of-cloud-computing.html>
 
@@ -745,7 +745,7 @@ If this practice exam has been helpful to you please share it with others and re
 
     <details markdown=1><summary markdown="span">Answer</summary>
 
-    Correct Answer: A
+    Correct Answer: C
 
     Explanation: <https://d1.awsstatic.com/whitepapers/AWS_Cloud_Best_Practices.pdf>