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GMAT prep PT1 - symbol

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Manager
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Joined: 04 Dec 2008
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GMAT prep PT1 - symbol [#permalink]

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New post 03 Mar 2009, 07:20
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Why stmt 1 is not sufficient? And how to work out stmt 2? IMO D but OA is B.
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Senior Manager
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Joined: 30 Nov 2008
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Schools: Fuqua
Re: GMAT prep PT1 - symbol [#permalink]

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New post 03 Mar 2009, 10:28
The question stem is asking whether the operator(I am representing it as @. Could not represent the little triangle in my reply note) takes + or * operation.

From stmt 1, it is given that A@B = B@A ==> This is basically an Associative property. And it is true for the operator taking a + or *. ie, A + B = B + A and A * B = B* A. So Insufficent to say what the operator is. Could be + or *.

From stmt2, it is given that A@(B-C) = (A@B) -(A@C) ==> This is basicaly a Distributive Property. And is true only when the operator takes * operation. ie A*(B-C) = (A*B) - (A*C). So this statement alone is sufficient.

IMO B.

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Re: GMAT prep PT1 - symbol   [#permalink] 03 Mar 2009, 10:28
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