S = {20,21,23,24,26,27,28,32,35,39,40),

A = {18,20,24,27), B=(21,24,28,32,39,40),

C= {20,21,23,24,26,27,28,32,35,39,40),

A c S: True or False?

B c S: True or False?

C c S: True or False?

C c S: True or False?​