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Let p(n) be the polynomial representing the number of ways of choosing 5 vertices of a convex n-gon, where n > 5, to form a convex pentagon, such that at least 2 sides of the pentagon are sides of the n-gon. What is p(1)? 

 Mar 8, 2021
 #1
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p(1) = 20.

 Mar 8, 2021
 #2
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no its 21 :P

 Mar 14, 2021

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