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If n is a positive integer, is (10^n)-1 divisible by Q ?

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If n is a positive integer, is (10^n)-1 divisible by Q ? [#permalink] New post 17 Jun 2011, 23:27
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Question Stats:

33% (02:40) correct 66% (01:09) wrong based on 1 sessions
could not find this discussed anywhere :

If n is a positive integer, is (10^n)-1 divisible by Q ?

Q is not divisible by either 5 or 2.
Q is not divisible by 9.

OA is
[Reveal] Spoiler:
E
.


My query :

From statement 1-Q can be either 3,7,9. insufficient.
From statement 2-Q can be either 3,7 insufficient(cannot be 9).

combined we know Q can be either 3 or 7, hence answer to this question is C-NO.
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Re: m12,#2 [#permalink] New post 18 Jun 2011, 01:25
bblast wrote:
could not find this discussed anywhere :

If n is a positive integer, is (10^n)-1 divisible by Q ?

Q is not divisible by either 5 or 2.
Q is not divisible by 9.

OA is
[Reveal] Spoiler:
E
.


My query :

From statement 1-Q can be either 3,7,9. insufficient.
From statement 2-Q can be either 3,7 insufficient(cannot be 9).

combined we know Q can be either 3 or 7, hence answer to this question is C-NO.


Not sure how you got C .
Im getting E
st.1 Q is not divisible by 5 or 2
so Q can be 3,7,9,13,17,.............. not sufficient

st2: Q is not divisible by 9
Q can be 2,3,4,5,6,7,8,13,17......... not sufficient

1 and 2 together

3,7,13,17....

10^n-1 is divisible by 3 but not by 7
hence insufficient . E

Note: where is question its mentioned that Q is a single digit Integer? U can take any number
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Re: m12,#2 [#permalink] New post 18 Jun 2011, 01:28
Oops:

I need to hammer my skull to get things aligned. :oops:

the answer is indeed E.
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Re: m12,#2   [#permalink] 18 Jun 2011, 01:28
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