Let n1,n2,⋯,nk be all the factors of a positive integer n including 1 and n. If n1+n2+⋯+nk=91, then the value of 1n1+1n2+⋯+1nk is
(correct answer + 2, wrong answer - 0.50)
cannot be determined from the given information
The correct option is C 91n
Since n1,n2,⋯,nk are factors of n,
nn1,nn2,⋯,nnk will also be factors of n.