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Question

By using Binomial theorem, prove that:
33n26n1 is divisible by 676, for all n N.

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Solution

33x26n1=(33)n26n1=27n26n1=(1+26)n26n1=[1+n26+nC2262+(higherterm)+.....]26n1=262[nC2+nC326+......higherterms]clearlyitwillbedivisibleby262or676forallnN


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