In a party attended by 21 persons, each clinch their glass with every other. How many glass clinches

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29 Jan 2019 Party

In a party attended by 21 persons, each clinch their glass with every other. How many glass clinches?

OPtion

1) 200
2) 105
3) 125
4) 121
5) 220
6) 201
7) 210
8) 205
9) 216
10) None of these

Solution

Total no. of person = 21
Total no. of glass clinches = n(n-1)/2
=21*20/2
= 210

Correct Option: 7 Best Solution (0)