Here is an interesting puzzle to tease your brain a bit. What do you think, how many triangles are shown in the photo above? Be careful and take your time before providing an answer. Once you are done thinking 👇
Click here to see the answer
That was fast 🤫. If your answer was 6, 12, 16 or 22 or any other number than 18, you were wrong. That’s right, the answer is 18. The best approach to this problem is to reduce it and find structure. There are three levels inside the triangle, and on each, you can choose a base among six different ways. This gives 3×6=18 triangles. Do you feel smarter now?