Alert: You are not allowed to copy content or view source
Check Olympiad Exam Dates here | Buy Practice Papers for CREST Olympiads here | Individual Registration will close soon on CREST Olympiads. Apply now | Login here to participate in all India free mock test on every Saturday


A horizontal line placed over an expression to show that everything below the line is one group, such as the horizontal line in the square root symbol that shows which values are part of the square root. In some countries it is the horizontal line used t