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# Does (a b) mean a-b

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