83. The faculty-student governing council at All State College has nine standing committees (such as Curriculum, Academic Standards, Campus Life) that are designated for convenience. The following table shows which committees have no member in common:
X | X | X | X | X | |||||
X | X | X | X | X | |||||
X | X | X | X | X | |||||
X | X | X | X | ||||||
X | X | X | X | ||||||
X | X | X | X | ||||||
X | X | X | X | ||||||
X | X | X | X | X | X | ||||
X | X | X | X | X |
83.
(a) Drawings can vary. Possible renderings include the following:
(b) 3
(c) 3