Combinations & Permutations Calculator
This add-in is an update to the original version that was posted in 2012. It works the same way but the Clear and Close buttons have been removed.
The add-in presents a window in which you enter the total number of items N and the number of items in a combination K. The starting values are N=4 and K=2 as seen here:
You can change either N or K, and the result updates automatically. Here is the result of entering 5 for K:
You can also request the number of permutations instead of the number of combinations with the radio button underneath the result:
