can anyone help~

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can anyone help~

by likewhoa » Mon Nov 26, 2007 7:15 pm
1≤n≤10, n is a positive integer, n=?

1) The tenth digit of n & 1/n is the same
2) The hundredth digit of n & 1/n is the same

answer? and pls kindly explain~~
Thx in advance!
Source: — Data Sufficiency |

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by sujaysolanki » Mon Nov 26, 2007 7:50 pm
Only numbers 3 and 6 will fit

1/3 = .33 and 1/6 = .166

From 1 the number can only be 3 hence A is sufficient

From 2 the number cud be 3 and 6 .

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Re: can anyone help~

by projase » Wed Nov 28, 2007 4:01 am
likewhoa wrote:1≤n≤10, n is a positive integer, n=?

1) The tenth digit of n & 1/n is the same
2) The hundredth digit of n & 1/n is the same

answer? and pls kindly explain~~
Thx in advance!
Lets take some examples for 1
n=1, then the tenth digit is 0, that is the same of 1/1
n=10, then the tenth digit is 0, that is different of 1/10 = 1.
n=3, then the tenth digit is 0, that is different of 1/3 = 3
You have only one option, n=1

Lets take some examples for 2
n=1, then the hundredth digit is 0, that is the same of 1/1
n=10, then the hundredth digit is 0, that is the same of 1/10 = 0.
n=3, then the hundredth digit is 0, that is different from 1/3 = 3
You have two options, n=1 or n=10

So, for me answer is A
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