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I recently came across this question which I was unable to solve. It says: Number of quadrilaterals that can be made using the vertices of a polygon of 10 sides as their vertices and having exactly: a)2 sides common with the polygon b)3 sides common with the polygon Any help will be appreciated.

I recently came across this question which I was unable to solve.


It says:


Number of quadrilaterals that can be made using the vertices of a polygon of 10 sides as their vertices and having exactly:


a)2 sides common with the polygon


b)3 sides common with the polygon


Any help will be appreciated.


 

Grade:

2 Answers

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

Make use of P and C

4 points out of 10 can be selected in 10C4 ways......

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Sagar Singh

B.Tech, IIT Delhi

Neer Varshney
76 Points
10 years ago

I dont think so Mr. Sagar Singh that 10C4 would be all right as it is mentioned that the quad. has (a)2 sides common and (b)3 sides common_ with the polygon!!!

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