A sequence consisting of the reciprocal of a natural number is called a harmonic sequence. People have been studying it for hundreds of years. But so far, they have not been able to get its summation formula, and can only get its approximate formula (when n is very large):1+1/2+1/3+...+1/n ≈ lnn. People tend to think that it has no simple summation formula. I think as a senior high school student and a college entrance examination student, we should not study this problem yet. I wish you success in the college entrance examination!

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