I learnt the above method in E-school

来源: 于 2009-07-22 23:36:15 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

so the answer is yes, depending on who the student is.

you have already seen a yahoo software engineer does not know how to calculate 1+2+...+n. do you think you have any method work for all E-school student?