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晕了，这两句话有什么不同？

Posted by Iamjw at 2006-09-06 22:20:55 on Problem 2819 
原来 c = c * (n - i + 1) / n / i 一直WA
改成 c = c / n / i * (n - i + 1) 后才AC 
(c 是 double, n, i都是 __int64)
是前者精度不行吗？
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