战败，来放狗。。

crystalmama

0<n<10,n是整数，n是几？
（1）1/n的十分位上就是n所代表的数字
（2）1/n的百分位上就是n所代表的数字

Since 0<n<10 and n is a whole number, then 1>1/n>0.1
n    1/n
1      1.00
2       0.50
3       0.333
4       0.25
5       0.20
6       0.166
7       0.142
8       0.125
9       0.099

The answer is n = 3

-- by 会员 sdcar2010 (2010/12/27 23:07:43)

问强人 此题是ds题的话，选啥？

sdcar2010

0<n<10,n是整数，n是几？
（1）1/n的十分位上就是n所代表的数字
（2）1/n的百分位上就是n所代表的数字

Since 0<n<10 and n is a whole number, then 1>1/n>0.1
n    1/n
1      1.00
2       0.50
3       0.333
4       0.25
5       0.20
6       0.166
7       0.142
8       0.125
9       0.099

The answer is n = 3

-- by 会员 sdcar2010 (2010/12/27 23:07:43)

问强人 此题是ds题的话，选啥？

-- by 会员 crystalmama (2010/12/27 23:15:52)

I will chose A.  

In fact in the example given, the second condition provided only confirms the result you would get from the first condition.

crystalmama

I got you! Thx!

lbccd

continue~ such as 6 7~~

lsbhome

p(n)是product of the amounts from 1 to n, 问p(11)+2,P(11)+4,P(11)+5,P(11)+7,这四个数中有几个是prime number?

P(11) has such factors as 2, 4, 5, 7

p(11)+2=2(1+P(11)/2) not prime
P(11)+4=4(1+P(11)/4) not prime
P(11)+5=5(1+P(11)/5) not prime
P(11)+7=7(1+P(11)/7) not prime

fanjiangguoyi

顶了！！！28号考