Work What they are calledRepairs cars and scooters MechanicTreats us when we are ill DoctorDelivers letters to our homes PostmanRepairs electrical devices ElectricianCleans the surroundings SweeperProvides protection to us Policeman This is a sample answer. The answer of the students might differ from this.
AA
×A A––––––––––––
+AA×––––––––––
ABA–––––––––––
For any two sets A and B, prove that
(i) (A∪B)−B=A−B
(ii) A−(A∩B)=A−B
(iii) A−(A−B)=A∩B
(iv) A∪(B−A)=A∪B
(v) (A−B)∪(A∩B)=A