In a certain circle there are 10 points. What is the number of the triangles connecting 2 points of the 10 points?	Options:  A) 40  B) 45  C) 108  D) 120  E) 132
IMO : B   HERE we have to select 2 points out of 10 points. Order is not important   So the answer will be 10c2 = 45   Answer 45
<result>B</result>
In a certain circle there are 10 points. What is the number of the triangles connecting 2 points of the 10 points?