Question: The 2 - TSP problem takes an undirected graph G = ( V , E ) with positive edge weights as well as a positive

The 2-TSP problem takes an undirected graph G =(V, E) with positive edge weights as
well as a positive integer k as input, and asks whether there are two closed tours in G such that
both tours together visit every vertex in V exactly once, and the total sum of all edge weights on
both tours is at most k. Prove that 2-TSP is NP-complete

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