[(B′∪(B′−A))]′ =___
A
B
A - B
B - A
[B′∪(B′−A)]′=[B′∪(B′∩A′)]′ (∵A−B=A∩B′)=[(B′∪B′)∩(B′∪A′))]′=[B′∩(A∩B)′]′=(B′)′∪((A∩B)′)′ (∵(A∩B)′=A′∪B′)=B∪(B∩A)=B
A TV channel organized an SMS (Short Message Service) poll on the prohibition on smoking, giving options like A- complete prohibition, B- prohibition in public places only, C- not necessary. SMS results in one hour were A B A B C B A B B A C C B B A B B A B C B A B C B A B B A
B B C B A B A B C B B A B C B B A B B A B B A B C B A B B A B C A B B ARepresent the above data as grouped frequency distribution table. How many appropriate answers were received? What was the majority of people's opinion?