How many ways can 3 dictionaries and 5 magazines be arranged on a shelf if there must be a dictionary on each end?
There are different ways to calculate something like this. Let me walk you through the way I approach this:
We have 8 things in total - 3 dictionaries and 5 magazines. There must be a dictionary on each end.
So let's talk about the ends first. The first end can be any 1 of 3 dictionaries and so that is
Next we have the other end which also must be a dictionary so that gives us another
Now we can arrange the remaining 5 magazines and 1 dictionary, so 6 items in total (this is a permutation calculation):
All in all, we have: