Returning to inclusion / exclusion

We’d taking a break from our inclusion / exclusion project but I wanted to return to it tonight. I picked a fairly challenging problem from one of my old math books:

How man 5 card poker hands have at least one card from each suit?

I didn’t have any idea how it would go . . .

We started by reviewing the ideas in inclusion / exclusion and the moved on to try to get our bearings in the problem:

Having formed a pretty good plan in the first video, we moved on to tackling the rest of the problem.

I’m really happy with how this went. It is fun to see the boys learning to break complicated problems down into problems that are slightly easier to deal with.

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