My answer is ...

回答: Quant 面试题:高兴指数(2星)康MM2010-11-10 06:22:54

(2n-1)/2

所有跟帖: 

Explanation..... -Commentate- 给 Commentate 发送悄悄话 (315 bytes) () 11/11/2010 postreply 10:01:53

回复:Explanation..... -wushuihe- 给 wushuihe 发送悄悄话 (68 bytes) () 11/11/2010 postreply 17:50:48

how about n=1?....n is right -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 11/11/2010 postreply 16:03:20

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