There are 7 non-collinear points. How many triangles can be drawn by joining these points?
Choose the correct choice from the following options.
A) 35
B) 10
C) 8
D) 7
E) 6
Solution:   A triangle is formed by joining any three non-collinear points in pairs.   There are 7 non-collinear points.   The number of triangles formed,   = 7C3   = [{7 *(7−1) *(7−2)} /3! ]   =(7 *6 *5)/(3 *2 *1) = 7 *5= 
<gadget id="calculator">7 *5</gadget>
<output>35</output>
35.   35nswer: Option 35
<result>A</result>
There are 7 non-collinear points. How many triangles can be drawn by joining these points?