**Counting is Not Always Easy**

Counting is not always easy, even for a small number of objects.

Here are the famous Borromean Rings. How many linkages are there?

Take any two rings and look at the linkage between them - there is none.

But you cannot pull these rings apart, so they must be linked. How many linkages are there?

Content written and posted by Ken Abbott abbottsystems@gmail.com