Math without words 
Instructions
- Move green dot to change the value of \(n\).
- Observe the configuration of points, for different values of \(n\).
- Find the sum value.
- Some applets have suggestions to help find the sum value. To see them put the black dot"on" (this option is only available when \(n>1\)). When there are several tips, they can been seen only by the presented order.
- To check the solution, put green dot "on".
