Potential of a Cube

Consider the potential \(V\) and magnitude \(E\) of an electric field at the vertex \(P\) of a uniformly charged cube of side length \(2s.\) Now, a cube of side length \(s\) (also with \(P\) as a vertex) is removed from the larger cube.

The new potential and magnitude of the electric field at \(P\)
are \(\dfrac{V}{x}\) and \(\dfrac{E}{y},\) respectively. What is \(3xy?\)

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