Question
If 12 people are playing in a tournament and each person plays every other person, how many games will be played?
Answers
nonononono
Mrs. Sue??
nonononono
Reiny
bobpursley
The first person plays 11, the second plays 10, the thrid plays 9
number games=11+10+9+...+1
the sum of numbers from n-1 to 1, or
number= N*(n-1)/2=12*11/2= 66
number games=11+10+9+...+1
the sum of numbers from n-1 to 1, or
number= N*(n-1)/2=12*11/2= 66
Reiny
number of subsets of 2 elements from a sample space of 12
= C(12,2) = 66
= C(12,2) = 66
aa
n*(n-1)/2
Katharine
66 people. Just do 132 / 2.