a)
A= {1,2,4,8,16,32,64}
B= {0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68}
b)
Card A = 7
Card B= 18 ⇒ Card A < Card B
c)
A U B = {0,1,2,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68}
A n B = {4,8,16,32,64}
A\B= {1,2}
B\A= {0,12,20,24,28,36,40,44,48,52,56,60,68}