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Binomial theorem for positive integral Index

Question

The remainder when 82n622n+1is divided by 9  is  

Moderate
Solution

82n622n+1

=(91)2n(631)2n+1= 2nC092n2nC192n1+2nC292n2 2nC2n1(9)+2nC2n 2n+1C0632n+12n+1C1632n+2n+1C2632n1+2n+1C1(63)2n+1C0

=9m+1+1=9m+2 for some integer m 

Thus, when 32n622n+1

is divided by,  9 the remainder is 2.



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