Prove that in a connected graph g every two longest paths

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1.- A tree is central if its center is K1 and bicentral if its center is K2. Show that every tree is central or bicentral. ( Kn is call complete graph and it if every two of its vertices are adjacent and every vertex has degree n)

2.- Prove taht a tree with Delta(T)=k ( Delta means maximum degree) has at least k vertices of degree 1.

3.- Prove that in a connected graph G every two longest paths have a common vertex.

Reference no: EM131026201

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Prove that in a connected graph g every two longest paths : Prove that in a connected graph G every two longest paths have a common vertex.
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