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Let d(1),d(2),d(3),......,d(k) be all th...

Let `d_(1),d_(2),d_(3),......,d_(k)` be all the divisors of a positive integer `n` including 1 and n. Suppose `d_(1)+d_(2)+d_(3)+......+d_(k)=72,` then the value of `(1)/(d_(1))+(1)/(d_(2))+(1)/(d_(3))+......+(1)/(d_(k))` is

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