Electric field by charges

A point charge \(Q\) is placed at a distance \(2R\) from the centre of a conducting charged spherical shell of radius \(R\) and having a charge \(Q\) as shown. The electric potential at point \(P\) due to charge on shell is \({\dfrac{aQ}{b \pi \epsilon_{o} R}}\), where \(a\) and \(b\) are coprime positive integers. Find \(a+b\).

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