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Using the brick wall method, we will calculate the entropy of Kerr-Newmanblack Hole and arrive at the already well established result. During thecalculation, we will arrive at the generalized equation for FNSR and FSR modeof free energy, which can be used to evaluate the free energy of any blackhole. And we will also show the detailed steps in our calculation to provideclarification about how we calculated it.

Generalization of brick wall method in Kerr-Newman Black Hole for entropy calculation