If 10 identical papers need to be filed away into any of 4 folders.
How many ways can they be filed away?
This is a fairly simple problem. The numbers we are dealing with are:
- The number of objects, r = 10
- The number of destinations, n = 4
After these numbers have been determined, they can be pluged into our forumla:
Solving by standard combination metnods, we get:
So there are 286 ways to file 10 identical papers into 4 folders.