Conic, your favorite math themed fast food drive-in offers 20 flavors which can be added to your soda. You have enough money to buy a large soda with 4 added flavors. How many different soda concoctions can you order if:
- You refuse to use any of the flavors more than once?
- You refuse repeats but care about the order the flavors are added?
- You allow yourself multiple shots of the same flavor?
- You allow yourself multiple shots, and care about the order the flavors are added?