Let $p$be the number of all triangles that can be formed by joining the vertices of a regular polygon$P$of $n$-sides and $q$be the number of all quadrilaterals that can be formed by joining the vertices of $P$. If $p+q=126$, then the eccentricity of the ellipse $\frac{{x}^{2}}{16}+\frac{{y}^{2}}{n}=1$ is :

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Let \(p\)be the number of all triangles that can be formed by joining the vertices of a regular polygon\(P\)of \(n\)-sid…

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