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M09 Q21

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Manager
Manager
Joined: 02 Aug 2009
Posts: 112
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Kudos [?]: 9 [0], given: 1

M09 Q21 [#permalink] New post 31 Mar 2010, 13:20
If the operation # satisfies X # Y = 1/(X # Y) for any non-zero number X and Y, which of the following can be #?

1. X # Y = 1/XY
2. X # Y = X/Y
3. X # Y = XY

None
1 only
2 only
1 and 2 only
1 and 3 only

[Reveal] Spoiler:
None
Senior Manager
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Affiliations: Volunteer Operation Smile India, Creative Head of College IEEE branch (2009-10), Chief Editor College Magazine (2009), Finance Head College Magazine (2008)
Joined: 26 Jul 2010
Posts: 472
Location: India
WE2: Entrepreneur (E-commerce - The Laptop Skin Vault)
Concentration: Marketing, Entrepreneurship
Schools: Kellogg '14 (D), CBS '15 (D), Haas '14 (D), Stern '14 (D), Kenan-Flagler '15 (A), Goizueta '15 (D), Boston U '15 (M)
GMAT 1: 710 Q49 V38
WE: Marketing (Other)
Followers: 10

Kudos [?]: 73 [0], given: 24

GMAT Tests User
Re: M09 Q21 [#permalink] New post 26 Sep 2010, 03:59
It has to be None

Coz if you replace each of the values in 1,2 & 3 in the original equation the final answer obtained is different than what we started with.

Nice question
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Re: M09 Q21   [#permalink] 26 Sep 2010, 03:59
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M09 Q21

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