prove by using mathematical induction method that 7^2n+2^3n-3*3^n-1 is divisible by 25 for any natural number n

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This Question is based on Induction , in induction first we check the equation by putting any value according to given condition then step :1 we assume p(k) satisfies the condition step :2 we proove it for p(k+1) done :

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