终于搞懂了,错误理解c,认为su大部分捐助来自极有可能捐的人,其实是就算这部分人,s也不花什么力气,这顶多是间接的加强
相比之下,a要更直接
(xX+yY)/(X+Y),按照文,x>y
suppose su is so Nu that their success rate among those less-likely prospects is as high as 最有可能的捐献者,极端情况,x=y,
so the equation turns out to 2xX/2x=x%,therefore,even if the number of less-likely prospects they tried equals that of the most likely prospects, the whole success rate will not be jeopardized. 努力的游说了再多貌似不可能的任务,成功率依然会很高
a, exclude this situation, so the more less-likely prospects su tried, the lower their success rate is. in fact, 80% is fairly high, indicating that su did not try many less-likely ppl at all. therefore,they are not good.
谢谢大家
[此贴子已经被作者于2005-7-24 15:57:15编辑过] |