Geometric Counting - 3 Row Triangle of Triangles

Thanks! :D

I actually just started on, a little over 1 week ago. I got involved with Brilliant when I met Brilliant's content team lead, Calvin, at a weekend workshop the AIM was hosting for a different web-resource project. I was already living and teaching extracurricular math in the Bay area, and when a math curriculum position opened up, the job listing went out through some SF Math Circle contacts, I applied. It was a great fit, so I signed on to start after the summer/a residential math institutor position wrapped up. I started on the 5th and I'm loving it so far!

Thank you for trying out my puzzles! I'm working on the combinatorics section right now, and just getting started really. :)

I think it feels like logic because it's an intro-problem that you can definitely figure out without any prior experience with combinatorics. You just need to employ a bit of intuition/logic/strategy. :)

But as Isaac says, the relevant strategies are definitely combinatorics-centric ones: casework, organized counting, etc. If you like this problem and found that kind of logic fun and intuitive, you might really get into combinatorics!

I disagree.

This seems like a typical begginers combinatorics question to me.

Finding clever ways to count.