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[lim_{ntoinfty} (1-frac{1}{cdot 2cdot 3})(1-frac{1}{2cdot 3cdot 4})cdots(1-frac{1}{ncdot (n+1)cdot (n+2)}).]
[lim_{ntoinfty}sum_{k=1}^nfrac{1}{k(k+1)cdots(k+nu)}.]
解答为: 1. $1/4$; 2. $1/(\nu\cdot\nu!)$.
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