Answer:
T(n)=n(n+1)/2
Explanation:
See the attached picture for detailed explanation.
1. Isn't fluent in "geek language"
2. Doesn't know how to use a web browser and it's features
3. Doesn't understand what a computer is and how it works
4. Doesn't know the basic parts of computer hardware
5. Doesn't know how to use a computer or any other electronics
3/20
Explanation:
You find the difference between the number of tennis case sold on Monday and Tuesday