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README.md

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 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 > This repository does not pretend to give you all answers for LinkedIn questions, rather it's a starting guide to help you prepare for the LinkedIn skills quiz and to know what to expect in the main exam or which areas to target in your exam preparations. Should you have found some incorrect answers, or want to contribute your answers, please feel free to create any PR changes - all are welcome!
 
+If you want to improve your skills on another test platform, I recommend the [Pluralsight tests](https://github.com/tik9/pluralsight-skill-test). On this repository, you can view questions and participate. Should you have found some incorrect answers or want to contribute your answers, please feel free to create any PR changes - all are welcome!
+
 ### Table of Contents
 
 | Quiz      |  Status |

c (programming language)/c quiz.md

@@ -271,7 +271,7 @@ main(){
 - [ ] by using recursive functions
 - [ ] by using global variables
 
-#### Q21. A union allows you to store differente _____ in the same _____.
+#### Q21. A union allows you to store different _____ in the same _____.
 
 - [ ] Objects; Structure
 - [ ] Variables; Declaration
@@ -296,6 +296,13 @@ main(){
 #### Q23. What is the difference between scanf() and sscanf() functions?
 
 - [ ] The scanf() function reads data formatted as a string; The sscanf() function reads string input from the screen.  
-- [x] The scanf() function reads formatted data from the keyword; The sscanf() function reads formatted input from a string.
-- [ ] The scanf() function reads string data from the keyword; The sscanf() function reads string data from a string.
+- [x] The scanf() function reads formatted data from the keyboard; The sscanf() function reads formatted input from a string.
+- [ ] The scanf() function reads string data from the keyboard; The sscanf() function reads string data from a string.
 - [ ] The scanf() function reads formatted data from a file; The sscanf() function reads input from a selected string
+
+#### Q24. What is not a valid command with this declaration?
+char *string[20] = { "one", "two", "three"};
+- [ ] printf("%c", string[1][2]);
+- [x] printf("%s", string[1][2]);
+- [ ] printf("%s", string[1]);
+- [ ] printf(string[1]);