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feixiaolin: ½ð±Ò+1 2014-12-18 12:45:34
I have similar consideration for this question. If consider exponential function, you may need to go to different compiler to know how they implemented this function.

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f(n) = [exp(K/n) + A]/[exp(K/n) + B]
      = exp(K/n)*exp(K/n)*  + (A+B)*exp(K/n) + AB
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