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If n is a positive integer, then show that `6^(n)-5n-1` is divisible by 25

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RESONANCE-COMBINATORICS-Self practice problems
  1. Expand the binomial ((x^(2))/(3) + (3)/(x))^(5)

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  2. Find term which is independent of x in (x^(2)-(1)/(x^(6)))^(16)

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  3. If n is a positive integer, then show that 6^(n)-5n-1 is divisible by ...

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