67.Five boxes maximum capacity currently hold pieces
90 70
80 70
50 30
80 50
40 40
rearrange it so that the maximum capacity - holding pieces for all five are
the same. So second box should be ?
[确认]64
[思路]所有差额的和为:20+10+20+30+0=80,5对数每对的平均差额为:80/5=16
因此second box:80-16=64
答案好象应为70+16=86,班主是否搞错了?
32. (PS)1-99,inclusive,其product为(n+1)n的multiple是几分之几?
[确认]2/3
此题不知如何解,求助。作者: smilingme 时间: 2002-11-6 19:15
第二题是如何得到的?
按我的理解:
1-99内只有2,6,12,20,30,42,56,72可以为n(n+1)
such as :
2=2*1
6=3*2
12=4*3
...
72=9*8
在往上就超过99了作者: smilingme 时间: 2002-11-7 08:59
咦,好像是哎!
容我再想想啊~~~~~
不好意思 :)作者: cook 时间: 2002-11-7 09:31
112.K*=K^2+1,K=? K*
(1)K=4n+1 (2)18<=K<=36
[确认]A ???
=========================
How to do? I can't understand.
32. the question has some problem, I think. " (其product)为(n+1)n的multiple是几分之几"作者: tongxun 时间: 2002-11-7 17:44
Can u do more explanation? Thank , tongxun!作者: tongxun 时间: 2002-11-7 23:21
cook:
32. (PS)1-99,inclusive,其product为(n+1)n的multiple是几分之几?
[确认]2/3
----------------
准确的旧机经是这样的:
n is a whole number in 1-99,inclusive。what is the possibility of the product of n(n+1) is mutiples of 3?作者: skycrash 时间: 2002-11-8 05:14
liu9001 why you say
such as :
2=2*1
6=3*2
12=4*3
...
72=9*8
在往上就超过99了
90=10*10 is also fit for the requirement.
Totally have 9 case.
1*2, 4*5, 7*8 can't be divided by 3.
so 9-3/9=2/3
are you with me?作者: brigittew 时间: 2002-11-8 17:33
i rememebered the answer of the question should be:
first, account the number of n, 99/3=33
then, the number of n+1, (since n has 99 possiblity, n+1 also has 99)99/3=33
so the posssibility of the multiple of 3 here is (33+33)/99=2/3
i dont know whether the answer is calculate as this.
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