Each person`s performance compared with all other persons is to be done to rank them subjectively. How many comparisons are needed in total, if there are 11 persons?

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Q: 117 (IAS/2010)
Each person's performance compared with all other persons is to be done to rank them subjectively. How many comparisons are needed in total, if there are 11 persons?
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question_subject: 

Maths

question_exam: 

IAS

stats: 

0,8,1,1,8,0,0

keywords: 

{'many comparisons': [0, 0, 1, 0], 'performance': [0, 0, 4, 2], 'other persons': [0, 0, 1, 0], 'persons': [4, 4, 9, 10], 'total': [0, 1, 1, 1]}