GRESub 4-21-2012 回忆题
只想说,这SUB真的太难了!没有复习题,不知道考什么,范围太广,题太多,一道题就需要半小时做。Problem:
what's the sum of the sequence $1-2/1!+3/2!-4/3!+5/4!-6/5!+...$
answer: 0 Problem: what's $D_5$? D=Derangement
好像别的题都记不起来了。没有Latex没法写 我也来不及做。后面的题目都没有时间想。 你的第一题我怎么感觉没有映像了x乘以e^(-x)求导。没印象啊!不是我太紧张看错题了吧! yes exactly the same question. I am at work right now. Can't really type Chinese
I think I will take the test again and I will do better since I know what it's like now. Just focus on about 30 problems and ignore the rest!
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