In a party attended by 21 persons, each clinch their glass with every other. How many glass clinches?
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Solution
Total no. of person = 21
Total no. of glass clinches = n(n-1)/2
=21*20/2
= 210
Total no. of person = 21
Total no. of glass clinches = n(n-1)/2
=21*20/2
= 210
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