[JEE Advanced 1982] prove that 7 2n 2 3n 3 3 n 1 is divisible by 25
Prove that $7^{2n}+2^{3n-3}\,3^{n-1}$ is divisible by $25$ for every natural number $n$.
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Prove that $7^{2n}+2^{3n-3}\,3^{n-1}$ is divisible by $25$ for every natural number $n$.
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