A content manager is working on an excel sheet. She has 6 columns in the sheet –

A content manager is working on an excel sheet. She has 6 columns in the sheet – A,B,C,D,E and F. She has to check that no two columns should have the same entry. She can check only 2 columns at a time. How many times will she have to repeat the comparing process to complete the process for the whole file?

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