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Does (a b) mean a-b

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Does (a b) mean a-b [#permalink] New post 12 Nov 2013, 11:58
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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Re: Does (a b) mean a-b [#permalink] New post 12 Nov 2013, 12:03
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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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Re: Does (a b) mean a-b [#permalink] New post 12 Nov 2013, 12:10
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..
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Re: Does (a b) mean a-b [#permalink] New post 12 Nov 2013, 22:17
@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.

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Re: Does (a b) mean a-b   [#permalink] 12 Nov 2013, 22:17
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