Question

Number of possible quadrilaterals ftom a convex polygon of 20 sides

Answer 1

The number of quadrilaterals is .

This can be found using combinations.

Let 'n' be 20. (Total number of points)

Let 'r' be 4. (Each quadrilateral has four sides)

So, answer is 20C4 = 20*19*18*17/1*2*3*4

                                = 4845 quadrilaterals

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