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" (7.) "7^(2n)+ul(2)^(3n-3)*3^(n-1)" is ...

" (7.) "7^(2n)+ul(2)^(3n-3)*3^(n-1)" is divisible by "25.

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7^(2n)+2^(3n-3)*3^(n-1) is divisible by 25

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For every natural number n, show that 7^(2n)+2^(3n-3)*3^(n-1) is always divisible by 25.

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