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Len n be an integer greater than 1 and let `a_(n)=(1)/(log_(n)1001).` If `b=a_(3)+a_(4)+a_(5)+a_(6)and c=_(11)+a_(12)+a_(13)+a_(14)+a_(15).` Than value of `(b-c)` is equal to

A

1001

B

1002

C

`-2`

D

`-1`

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