Algorithms | Graph Minimum Spanning Tree | Question 1

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An undirected graph G(V, E) contains n ( n > 2 ) nodes named v1 , v2 ,….vn. Two nodes vi , vj are connected if and only if 0 < |i – j| <= 2. Each edge (vi, vj ) is assigned a weight i + j. A sample graph with n = 4 is shown below. What will be the cost of the minimum spanning tree (MST) of such a graph with n nodes? (GATE CS 2011) gate_2011_4

1/12(11n^2 – 5n)
n^2 – n + 1
6n – 11
2n + 1
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