Minimum Spanning Trees 1
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Question 1 of 4
1. Question
Draw the minimum spanning tree of this network.Hint
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A minimum spanning tree is a spanning tree of a network made with the minimum sum of edges available.First, draw a diagram to plot the vertices of the network.Next, determine which of the edges has the lowest weight or value.`QR` `=` `60` `QS` `=` `70` `PT` `=` `70` `ST` `=` `80` `PQ` `=` `85` `QT` `=` `90` `SR` `=` `100` `PR` `=` `110` Now use the edges with the lowest weights to create a spanning tree.These diagram fits the criteria of a spanning tree and also uses the edges with the minimum weight. 
Question 2 of 4
2. Question
Find the length of the minimum spanning tree of this network. (87)
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A minimum spanning tree is a spanning tree of a network made with the minimum sum of edges available.First, list down all the vertices connected to vertex `P` and find which one has the lowest value.`P` `=` `(27,19,``18``)` Next, list down all the vertices connected to vertices `P` and `Q` and find which one has the lowest value.`PQ` `=` `(27,``19``,22,24)` Keep doing this process until you have all the vertices connected. Keep in mind that a spanning tree cannot have any cycles and will have one less edge than its vertices.Notice that the lowest value connected to vertices `P`, `Q`, and `R` is `22`, but using that edge will create a cycle. Therefore, we pick the second lowest value, which is `24`.`PQT` `=` `(27,22, ``24``,31,32)` `PQTR` `=` `(27,32,31, ``26``)` Finally, get the sum of the edges of the spanning tree.minimum length `=` `19+18+24+26` `=` `87` `87` 
Question 3 of 4
3. Question
Find the length of the minumum spanning tree of this network. (17)
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Prim’s Algorithm is a method of finding a minimum spanning tree by continuously listing the edges connected to a vertex and picking the edges with the lowest weight.First, draw a diagram to plot the vertices of the network.Next, pick a starting vertex and list down the value of the edges connected to it. We can start at vertex `A`.`A` `:` `(3,5)` Pick the edge with the lowest weight and draw it in the diagram`A` `:` `(``3``,5)` Next, list the edges connected to `A` and `G`, pick the one with the lowest weight and add it to the diagram.`AG` `:` `(5,``4``,8)` Next, list the edges connected to `A`, `G` and `B`, pick the one with the lowest weight and add it to the diagram.`AGB` `:` `(8,``2``,7,4)` Next, list the edges connected to `A`, `G`, `B` and `C`, pick the one with the lowest weight and add it to the diagram.`AGBC` `:` `(8,7,4,``3``)` Next, list the edges connected to `A`, `G`, `B`, `C` and `D`, pick the one with the lowest weight and add it to the diagram.`AGBCD` `:` `(4,8,``3``,5)` Next, list the edges connected to `A`, `G`, `B`, `C`, `D` and `E`, pick the one with the lowest weight and add it to the diagram.`AGBCDE` `:` `(``2``,5,8,4)` Notice that all the vertices are now connected and we have `6` edges, one less than the number of vertices.This diagram fits the criteria of a spanning tree and is also using the edges with the minimum weights.Finally, get the sum of the edges of the spanning tree.minimum length `=` `3+2+4+3+3+2` `=` `17` `17` 
Question 4 of 4
4. Question
Find the length of the minumum spanning tree of this network. (12)
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Kruskal’s Algorithm is a method of finding a minimum spanning tree by selecting the edges by least to most.First, draw a diagram to plot the vertices of the network.Next, list down the edges with the values going from least to most. Since we only need `5` edges to make a spanning tree for this network, pick the `5` edges with the least value.`FE` `=` `2` `EB` `=` `2` `DC` `=` `2` `EA` `=` `3` `BC` `=` `3` `FA` `=` `4` `ED` `=` `4` `AB` `=` `5` `EC` `=` `5` Now draw the `5` edges with the lowest values in the diagramNotice that all the vertices are now connected and we have `5` edges, one less than the number of vertices.This diagram fits the criteria of a spanning tree and is also using the edges with the minimum weights.Finally, get the sum of the edges of the spanning tree.minimum length `=` `2+3+2+3+2` `=` `12` `12`
Quizzes
 Vertices and Edges
 Degrees 1
 Degrees 2
 Degrees 3
 Drawing a Network 1
 Drawing a Network 2
 Completing a Table from a Network Diagram
 Network from Maps and Plans
 Identify Paths and Cycles
 Eulerian Trails and Circuits 1
 Eulerian Trails and Circuits 2
 Identify Spanning Trees
 Minimum Spanning Trees 1
 Minimum Spanning Trees 2
 Shortest Path 1
 Shortest Path 2