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标题: 几道新机警,请看看.谢过!! [打印本页]

作者: carolexl    时间: 2002-10-4 12:44     标题: 几道新机警,请看看.谢过!!

10/4 5.一排位子,A在其中,A在从左数的第30个从右数的第33个, 在A的左边抽去2个右边抽去4个,还剩多少 (during my test, it is about books on a shelf) 8.2的N次方是10!的因子,问N最大是几 9.n把椅子(1-n)放在环形的路上,其中3号在顶(top),18号在底(bottom),问n=? math new JJ. 3、What is the possibility of event A or event B or both? A) The possibility of event A is 0.6 B) The possibility of event B is 0.4 5、there is a list M( m1,m2, m3, …..m10), ask: 是否至少有7个小于9? A)LIST中至少有一个大于9 B)The number after the third is at least greater than the preceding one. 6、有一个集合里有一个数是20,问RANGE是否大于12? A)最大的数是50 B)最小的数是30(数字不确定) (好险,confirm之前发现错了) 8、98年产量是X, 2000年产量是Y,问产量下降是否超过10%? A)X/Y>5/4 B) Y/X>1/4 6.有100位选民,A B两个候选人, 有一个两行三列的表格,分别列出多少人支持A,反对A,中立;多少人支持B,反对B,中立。问既又支持A支持B的有机人。 (1)有10人既反对A反对B (2)一共有XX人中立。 .?Min(10,M) (1)M=Max(20,Z) (2)M=Max(10,M) DS: 45% the apartments with <=3 people living in each one. What’s the median? (1)80% of the apartments have <=5 (2)35% of the apartments have >=5 ###(C) Note: Median is 4 what is the meaning of the following sentence?? :::: there are no any entrees ordered by more than 5 people DS: 4 entrees, one of them is “dish”, 15 people, Q: is there at least 1 person order “fish”? (1)there are no any entrees ordered by more than 5 people (2)one dish less than 4 people ordered …(something like this)… ### (C) …(SURE) Why??????? 海伦公式是什么???? 2。四信放四信封,求只有一封放对的概率 --------------------------------- 1/3 WHY??? 求大于700的三位数中奇数个数?(要求every unit is non zero, and different) (91) WHY?? 还是不明白,请讲讲 [em18]
作者: tongxun    时间: 2002-10-4 13:12

5、A在从左数的第30个从右数的第33个:30与33重复,必须减去1。共30+32=62个。
   在A的左边抽去2个右边抽去4个:减掉6个。62-6=56。
8、2的N次方是10!的因子,问N最大是几
1*2*3*。。。*10,中含2的数有:2*4*6*8*10=2^8, n may be one of sequence(1,2,3,...8), so  the biggest one is 8.
作者: tongxun    时间: 2002-10-4 13:30

9、16+14=30
  半圆中由3-18共16个,另一半圆则为14个(减去两个顶点)
新机警:
3、E 因为不能确定是否是独立事件。
5、E可有1个或多个。




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