In a certain circle there are 10 points. What is the number of the triangles connecting 4 points of the 10 points? Pick one.
A) 80
B) 96
C) 108
D) 120
E) 210
IMO : E   HERE we have to select 4 points out of 10 points. Order is not important   So the answer will be 10c4 = 210
<result>E</result>
In a certain circle there are 10 points. What is the number of the triangles connecting 4 points of the 10 points?