Figure shows three blocks on a rough surface under the influene of a force `P` of the same magnitude

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Figure shows three blocks on a rough surface under the influene of a force `P` of the same magnitude in all the three cases. Coefficient of friction is the same between each block and the ground. What possile relation holds between the magnitudes of normal reaction and friction force?(Assume that the blocks do not overturn about edge.) Here `f_(A), f_(B)` and `f_(C)` are frictional forces and `N_(A), N_(B)` and `N_(C)` are reactions.
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