exactly do we use open and closed brackets...??
The complete explanation can be given as,
- (.....) means that the first and last member of the set are not included in the set.
- (......] means first member is not included in the set but last member is included in the set.
- [.....)means first member is included in the set but last member is not included in the set
- [.....]means first member and last member both are included in the set.