I come up with the same answer EVERYTIME! but when submitted I was marked wrong. Can anyone help me to understand where I am going wrong?
It’s hard to say what might be going on without seeing your work, but here are a few tips:
The second half of this video does a nice job of demonstrating how to approach these problems, and gives some troubleshooting tips: https://youtu.be/JPufD4PEYvY
I would suggest trying out a slightly different grouping strategy to see if you come up with something different.