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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 side of the polygon is also the side of the quadrilateral is

A

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

B

`(""^(15)C_(3)-20)/(4)`

C

`2275`

D

`2125`

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The correct Answer is:
A, B, C
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