playingwithnumbrs
New member
- Joined
- Aug 17, 2019
- Messages
- 4
I have 20 values (A-T) that can be arranged into 3 slots in different combinations. Order only matters when the value in the middle slot is different. For example: A-B-C is the same as C-B-A and would count as one combination, but they are both separate from B-A-C, which would count as a second combination because the middle value is different. I need to find how many combinations can be made. What equations would I use?