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# Does (a b) mean a-b

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Intern
Joined: 02 Oct 2013
Posts: 9

Kudos [?]: 6 [0], given: 12

Does (a b) mean a-b [#permalink]

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12 Nov 2013, 12:58
In my recent princeton review question, I encountered expression (a b), and couldn't decide what does it supposed to mean..

Guess what while looking at the solution, I found out they considered it as a - b
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Kudos [?]: 6 [0], given: 12

Math Expert
Joined: 02 Sep 2009
Posts: 41893

Kudos [?]: 128834 [0], given: 12183

Re: Does (a b) mean a-b [#permalink]

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12 Nov 2013, 13:03
rajat0627 wrote:
In my recent princeton review question, I encountered expression (a b), and couldn't decide what does it supposed to mean..

Guess what while looking at the solution, I found out they considered it as a - b

I think it's a simple typo. It should read a-b.
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Kudos [?]: 128834 [0], given: 12183

Intern
Joined: 02 Oct 2013
Posts: 9

Kudos [?]: 6 [0], given: 12

Re: Does (a b) mean a-b [#permalink]

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12 Nov 2013, 13:10
Bunuel wrote:
rajat0627 wrote:
In my recent princeton review question, I encountered expression (a b), and couldn't decide what does it supposed to mean..

Guess what while looking at the solution, I found out they considered it as a - b

I think it's a simple typo. It should read a-b.

Well, I also thought same at first, But the fact that its used in the explanation as well, and that it is in the test made me wonder, thnx anyways..

Kudos [?]: 6 [0], given: 12

Director
Affiliations: GMATQuantum
Joined: 19 Apr 2009
Posts: 603

Kudos [?]: 489 [0], given: 17

Re: Does (a b) mean a-b [#permalink]

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12 Nov 2013, 23:17
@rajat0627

Yes, this is a typo, they meant a-b, obviously such a blunder on a question while taking a practice test can throw off any student. I actually don't like this question because the example they use a=11 and b=7 does not eliminate answer choice D which is equal to a+b-1 or 11+7-1=17 which is a prime number. This is also the case with choice E, where 11+7=18 is a multiple of 3. I would advise you to stick to official GMAT questions, there is plenty of material out there. There is no need to spend your valuable time on poorly written questions.

Dabral

Kudos [?]: 489 [0], given: 17

Re: Does (a b) mean a-b   [#permalink] 12 Nov 2013, 23:17
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