Herbie3070
07.10.2020 •
Mathematics
Consider the statement "every non trivial tree has exactly two leaves". The following is an attempted proof of the statement using induction on n, where n the number of vertices. Base case: n=2. The tree is a path, and has exactly two leaves. Inductive hypothesis: Assume that every tree on k vertices has exactly two leaves. Inductive step: Consider a tree T on k vertices. It has exactly two leaves. Add a vertex, make the new vertex adjacent to a leaf of T. Now the new tree has k+1 vertices, and has exactly two leaves. What is wrong with the proof?
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Ответ:
The area of the rectangle would be (11)(7) =77
The area of the square is (6)(6)=36
77+36=113
Hope this helped :)