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Mathematics 12 Online
OpenStudy (anonymous):

For each positive integer n, let H _{n} = 1/1 +1/2 +⋯+ 1/n sum_{n=4}^{∞} 1/n*H_{n}*H_{n-1}=a/b for relatively prime positive integers a and b, find a+b

OpenStudy (anonymous):

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