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# M02 Q2

Author Message
Manager
Joined: 27 Dec 2009
Posts: 167

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30 Apr 2010, 03:19
If x and y are positive integers, is x^16 -y^8 +345(y^2) divisible by 15?
1. x is a multiple of 25, and y is a multiple of 20
2. y = x^2

It is obvious that statement 2 is sufficient.
From Statement 1 , we can also conclude that it is not divisable by 3 and therefore not divisible by 15 .
OA :
[Reveal] Spoiler:
B

What am I missing ?
CIO
Joined: 02 Oct 2007
Posts: 1218

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30 Apr 2010, 03:24
Hi,
This question has already been discussed here:
m02-02-not-convinced-with-method-used-to-explaing-the-ans-76875.html

If you can't find the discussion you need in the thread above, please use Forum Search or Custom Google Search available at the top of every page.

Please do not create duplicate topics. Thank you for cooperation .
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Manager
Joined: 27 Dec 2009
Posts: 167

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30 Apr 2010, 04:24
dzyubam wrote:
Hi,
This question has already been discussed here:
m02-02-not-convinced-with-method-used-to-explaing-the-ans-76875.html

If you can't find the discussion you need in the thread above, please use Forum Search or Custom Google Search available at the top of every page.

Please do not create duplicate topics. Thank you for cooperation .

Hi,
Thanks for pointing out the correct thread. Do the search always - this time it was with no luck in finding the right thread
I should have tried more.Apology .

Thanks once more.
Re: M02 Q2   [#permalink] 30 Apr 2010, 04:24
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# M02 Q2

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