Question

已知：｛a,b｝真包含于A包含于｛a,b,c,d,e,f｝,写出满足条件的所有集合A．

Answer 1

{a,b,c}{a,b,d}{a,b,e}{a,b,f}{a,b,c,d}{a,b,c,e}{a,b,c,f}{a,b,d,e}{a,b,d,f}{a,b,e,f}{a,b,c,d,e}{a,b,c,d,f}{a,b,c,e,f}{a,b,d,e,f}{a,b,c,d,e,f}