n (имя) существительное

1. We know that's a tree on n vertices has n minus 1 edges.

2. on n.

3. like, well, there are n minus 1 edges in any n vertex tree.

4. So a tree with n vertices has n minus 1 edges.

5. So we suppose P of n.

6. It's a tree on n vertices.

7. every such tree has n edges.

8. So we have n vertices.

9. has n minus 1 edges.

10. E has successfully n minus 1 edges.

11. So that's all together exactly n edges.