題組內容
7. For n≥ 1, let
= {1, 2,3, ..,n}.
denotes the power set of 
(b) Please find
the number of vertices of the diagram in (a).
7. For n≥ 1, let
= {1, 2,3, ..,n}.
denotes the power set of 
(b) Please find
the number of vertices of the diagram in (a).