12 points lie on a circle. How many cyclic quadrilaterals can be drawn by using these points?
Choose the correct option.
A) 990 B) 495 C) 1980 D) none E) Cannot be determined
Explanation :   For any set of 4 points we get a cyclic quadrilateral. Number of ways of choosing 4 points out of 12 points is 12C4=495Therefore, we can draw 495 quadrilaterals.   Answer : 495
<result>B</result>
12 points lie on a circle. How many cyclic quadrilaterals can be drawn by using these points?