Dielectrics in capacitors

In the above diagram, there are three capacitors P, Q and R with their respective distinct dielectric materials. The dielectric constant and the thickness of the dielectric material for P, Q and R are \((2\kappa, d), (\kappa, 2d)\) and \((3\kappa, 3d),\) respectively. Let \(C_P,\) \(C_Q\) and \(C_R\) denote the electric capacities of the three capacitors, respectively, then what is the ratio \(C_P:C_Q:C_R?\)

The plate areas of the three capacitors are the same.

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