ANY HELP WOULD BE GREATLY APPRECIATED! PLZ!!

The curator of an art exhibit wants to place security guards along the six walls of a large hexagonal auditorium so that each wall has the same number of guards. Any guard who is placed in a corner can watch the two adjacent walls, but each of the other guards can watch only the wall by which she or he is placed.
a. Draw a sketch to show how this can be done with 9 security guards.
b. Show how this can be done for each of the following numbers of security guards: 10, 11, 12, 13, 14, 15.
c. List all the numbers less than 100 that are solutions to this problem.

Question

ANY HELP WOULD BE GREATLY APPRECIATED! PLZ!!

The curator of an art exhibit wants to place security guards along the six walls of a large hexagonal auditorium so that each wall has the same number of guards.  Any guard who is placed in a corner can watch the two adjacent walls, but each of the other guards can watch only the wall by which she or he is placed.
a.	Draw a sketch to show how this can be done with 9 security guards.
b.	Show how this can be done for each of the following numbers of security guards:  10, 11, 12, 13, 14, 15.
c.	List all the numbers less than 100 that are solutions to this problem.