Let the triangle $P Q R$ be the image of the triangle with vertices $(1,3),(3,1)$ and $(2,4)$ in the line $x+2 y=2$. If the centroid of Δ PQR is the point $(\alpha, \beta)$, then $15(\alpha-\beta)$ is equal to :

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Let the triangle \(P Q R\) be the image of the triangle with vertices \((1,3),(3,1)\) and \((2,4)\) in the line \(x+2 y=…

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