five points lie on the circumference of a ellipse. What is the positive difference between the number of triangles and the number of quadrilaterals that can be created by connecting these points? Choices.
A) 4  B) 15  C) 6  D) 5  E) 20
Number of triangles can be formed out of 6 points= 5C3=10   Number of quadrilaterals can be formed out of 6 points= 5C4=5   10-5= 
<gadget id="calculator">10-5</gadget>
<output>5</output>
5.   Answer=5
<result>D</result>
five points lie on the circumference of a ellipse. What is the positive difference between the number of triangles and the number of quadrilaterals that can be created by connecting these points?