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Let $G$ be a weighted graph with edge weights greater than one and $G'$ be the graph constructed by  
 
Let $G$ be a weighted graph with edge weights greater than one and $G'$ be the graph constructed by  
 
squaring the weights of edges in $G$. Let $T$ and $T'$ be the minimum spanning trees of $G$ and $G'$,  
 
squaring the weights of edges in $G$. Let $T$ and $T'$ be the minimum spanning trees of $G$ and $G'$,  
respectively, with total weights $t$ and $t'$. Which of the following statements is '''TRUE'''?  
+
respectively, with total weights $t$ and $t'$. Which of the following statements is '''TRUE'''?
 +
 
(A) $T' = T$ with total weight $t' = t^2 $
 
(A) $T' = T$ with total weight $t' = t^2 $
 
   
 
   

Revision as of 13:10, 8 December 2013

Let $G$ be a weighted graph with edge weights greater than one and $G'$ be the graph constructed by squaring the weights of edges in $G$. Let $T$ and $T'$ be the minimum spanning trees of $G$ and $G'$, respectively, with total weights $t$ and $t'$. Which of the following statements is TRUE?

(A) $T' = T$ with total weight $t' = t^2 $

(B) $T' = T$ with total weight $t' < t^2$

(C) $T' \neq T$ but total weight $t' = t2$

(D) None of the above

Let $G$ be a weighted graph with edge weights greater than one and $G'$ be the graph constructed by squaring the weights of edges in $G$. Let $T$ and $T'$ be the minimum spanning trees of $G$ and $G'$, respectively, with total weights $t$ and $t'$. Which of the following statements is TRUE?

(A) $T' = T$ with total weight $t' = t^2 $

(B) $T' = T$ with total weight $t' < t^2$

(C) $T' \neq T$ but total weight $t' = t2$

(D) None of the above