Hai.. I need help to solve this question.

I just dont understand what is the meaning by the greatest integer in the form of sets.

for example (a);

f-1=(B)

B^{-1}={0,1} . I get until this step. But how to solve it using the greatest integer @ floor of x?

I also dont understand about the different between {} , [ ], and( ) .

Thanks for the help.