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# ds

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Senior Manager
Joined: 02 Feb 2004
Posts: 344

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23 Mar 2005, 06:54
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easy one;)
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VP
Joined: 30 Sep 2004
Posts: 1480
Location: Germany

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23 Mar 2005, 08:12
D)

1) there must be at least on multiple of 3 in x => square of x squares the multiple of 3 => suff

2) there must be at least one multiple of 9 in x or in y or at least one multiple of 3 in y and in x => suff
Senior Manager
Joined: 19 Feb 2005
Posts: 486
Location: Milan Italy

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23 Mar 2005, 08:57
yeah yeah I like this question
agree on D
Senior Manager
Joined: 15 Mar 2005
Posts: 418
Location: Phoenix

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23 Mar 2005, 11:01
(D)

Statement 1:

x is divisible by 3. Therefore x^2 is divisible by 9. Therefore x^2 * <something> is also divisible by 9.

Statement 2:

x*y is divisible by 9. Therefore x^2 * y^2 is divisible by 9 too. Therefore x^2 * y^2 * <something> is divisible by 9 too.
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Director
Joined: 21 Sep 2004
Posts: 607

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23 Mar 2005, 13:13
D it is..
Senior Manager
Joined: 02 Feb 2004
Posts: 344

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23 Mar 2005, 14:10
Sorry guys. Ans is E. Coz X^2Y^4 could be 1 and not divisible by 9 when x=81, & Y= 1/9
23 Mar 2005, 14:10
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