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n
(имя) существительное
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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.
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