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GMAT CLUB TEST QUESTION

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GMAT CLUB TEST QUESTION [#permalink] New post 17 Jan 2011, 23:09
If x and y are positive integers, is the integer 10^x - y divisible by 9 ?
1. y is divisible by 3
2. 10^x + y is not divisible by 9
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Re: GMAT CLUB TEST QUESTION [#permalink] New post 20 Jan 2011, 00:42
I guess answer is A - Stmt 1 is sufficient to say its not divisible by 9..

For any x - 10^x leaves a reminder 1, and when y is multiple of 3 (could be 3,6,9..) the second part y/9 can never leave a reminder 1.

Pls correct me if am wrong.
Re: GMAT CLUB TEST QUESTION   [#permalink] 20 Jan 2011, 00:42
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