Graph Theory (Eulerian, radius, diameter..)

[Adolf Reiner]

Can someone help me solve this?

Thank you in advance

 

[Deleted member 4993]

Can someone help me solve this?

Thank you in advance

What are your thoughts?

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...Before-Posting!!

 

[Adolf Reiner]

The first problem it's easy.
In the second..
Well, the problem is that usually I don't know where to start.