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# Decision maths help! watch

1. Please can someone explain this to me!
3 A simple graph is one in which any two vertices are directly connected by at most one arc and no
vertex is directly connected to itself.
A connected graph is one in which every vertex is connected, directly or indirectly, to every other
vertex.
A simply connected graph is one that is both simple and connected.
(i) A simply connected graph is drawn with 6 vertices and 9 arcs.
(a) What is the sum of the orders of the vertices? [1]
(b) Explain why if the graph has two vertices of order 5 it cannot have any vertices of order 1.
[2]
(c) Explain why the graph cannot have three vertices of order 5. [2]
2. (Original post by benitashrestha)
Please can someone explain this to me!
3 A simple graph is one in which any two vertices are directly connected by at most one arc and no
vertex is directly connected to itself.
A connected graph is one in which every vertex is connected, directly or indirectly, to every other
vertex.
A simply connected graph is one that is both simple and connected.
(i) A simply connected graph is drawn with 6 vertices and 9 arcs.
(a) What is the sum of the orders of the vertices? [1]
(b) Explain why if the graph has two vertices of order 5 it cannot have any vertices of order 1.
[2]
(c) Explain why the graph cannot have three vertices of order 5. [2]
Could you specify which question you need an explanation for?
3. (Original post by .raiden.)
Could you specify which question you need an explanation for?
All if possible please!

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