Number of quadrilaterals which can be co...

Number of quadrilaterals which can be constructed by joining the vertices of a convex polygon of 20 sides if none of the sides of the polygon is also the side of the quadrilateral is:

`.^(17)C_(4) - .^(15)C_(2)`

`(.^(15)C_(3).20)/(4)`

`2275`

`2125`

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