1.

Number of quadrilaterals which can be constructed by joining the vertices of a convex polygon of 20 sides if none of the side of the polygon is also the side of the quadrilateral isA. `.^(17)C_(4) - .^(15)C_(2)`B. `(.^(15)C_(3).20)/(4)`C. `2275`D. `2125`

Answer» Correct Answer - A


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