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# If mn≠0, what is the value of m+1/m-n+1/n?

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6826
GMAT 1: 760 Q51 V42
GPA: 3.82
If mn≠0, what is the value of m+1/m-n+1/n?  [#permalink]

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Updated on: 02 Mar 2017, 04:20
00:00

Difficulty:

25% (medium)

Question Stats:

82% (00:40) correct 18% (00:52) wrong based on 76 sessions

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If mn≠0, what is the value of $$\frac{m+1}{m}-\frac{n+1}{n}$$?

1) m=n
2) m=1

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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"Only $149 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Originally posted by MathRevolution on 28 Feb 2017, 00:42. Last edited by Bunuel on 02 Mar 2017, 04:20, edited 1 time in total. Edited the OA. Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6826 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: If mn≠0, what is the value of m+1/m-n+1/n? [#permalink] ### Show Tags 02 Mar 2017, 00:37 ==> If you modify the original condition and the question, you get $$\frac{m+1}{m}-\frac{n+1}{n}=\frac{n(m+1)-m(n+1)}{mn}= \frac{nm+n-mn-m}{mn}=\frac{n-m}{mn}=?$$. Then, for con 1), m=n, so n-mmn=0, hence it is unique and sufficient. The answer is A. Answer: A _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$149 for 3 month Online Course"
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Re: If mn≠0, what is the value of m+1/m-n+1/n?  [#permalink]

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02 Mar 2017, 00:40
1
MathRevolution wrote:
==> If you modify the original condition and the question, you get $$\frac{m+1}{m}-\frac{n+1}{n}=\frac{n(m+1)-m(n+1)}{mn}= \frac{nm+n-mn-m}{mn}=\frac{n-m}{mn}=?$$. Then, for con 1), m=n, so n-mmn=0, hence it is unique and sufficient.

MathRevolution : The correct option is A but the OA marked in the question is B, can you please correct it ?
Math Expert
Joined: 02 Sep 2009
Posts: 52390
Re: If mn≠0, what is the value of m+1/m-n+1/n?  [#permalink]

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02 Mar 2017, 04:21
0akshay0 wrote:
MathRevolution wrote:
==> If you modify the original condition and the question, you get $$\frac{m+1}{m}-\frac{n+1}{n}=\frac{n(m+1)-m(n+1)}{mn}= \frac{nm+n-mn-m}{mn}=\frac{n-m}{mn}=?$$. Then, for con 1), m=n, so n-mmn=0, hence it is unique and sufficient.

MathRevolution : The correct option is A but the OA marked in the question is B, can you please correct it ?

Done. Edited the OA. Thank you.
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Re: If mn≠0, what is the value of m+1/m-n+1/n? &nbs [#permalink] 02 Mar 2017, 04:21
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