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A level decision maths

Hello, I don't understand how to answer questions on simple graphs from the AQA D1 book Chapter 5. If you have the book I am talking about page 92 worked example 5.1, although they give a solution it is not explained and I can't figure it out myself. If you don't have the book but can/ want to help this is the question..

A simple graph, G (not drawn) has six vertices and their degrees are 2d, 2d, 2d+1, 2d+1, 2d+1 and 3d-1 where d is an integer

a) By considering the sum of all the degrees, show that d is even.
b) Use the fact that the graph is simple to show that d<3 and state the value of d.
c) Draw a possible graph G

I REALLY need help with this, thanks!

Reply 1

tiny hobbit

Nice question!

I'll pinch it for my (Edexcel) students.

Reply 2

Room4student

Original post by tiny hobbit

Nice question!

I'll pinch it for my (Edexcel) students.

Haha ok and do you know of any good ie harder questions that I could do from edexcel past papers? I do aqa but I imagine a lot of the content will overlap.

Reply 3

tiny hobbit

Original post by Room4student

Haha ok and do you know of any good ie harder questions that I could do from edexcel past papers? I do aqa but I imagine a lot of the content will overlap.