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Difficulty:
5%
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Question Stats:
86% (00:54) correct
14%
(01:00)
wrong
based on 1028
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Does the product jkmn equal 1?
(1) \(\frac{jk}{mn} = 1\)
(2) \(j = \frac{1}{k}\) and \(m = \frac{1}{n}\)
(1) \(\frac{jk}{mn} = 1\)
(2) \(j = \frac{1}{k}\) and \(m = \frac{1}{n}\)
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paki
B.
1) JK/MN = 1 ..... JK = MN , all we know is that JK and MN are equal, but could be any value, not just 1..... INSUFF
2) Substitute: (1/K)*K*(1/N)*N = 1.... SUFF
GMAT 2: 710 Q48 V40
Posts: 43
Bumping this up for a quick question.
Original question is asking whether jkmn = 1.
I rephrased to: does jk = 1/(mn) by dividing both sides by mn
Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.
Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient
I chose answer choice D while the OA is B. Can someone please explain where I went wrong?
Original question is asking whether jkmn = 1.
I rephrased to: does jk = 1/(mn) by dividing both sides by mn
Statement 1: jk/mn = 1 --> rephrase to jk = mn
Since jk = mn and does not equal 1/mn, I said this was sufficient.
Statement 2: j = 1/k; m = 1/n --> rephrase to jk = 1 and mn = 1
Sufficient
I chose answer choice D while the OA is B. Can someone please explain where I went wrong?
NvrEvrGvUp
jk = mn and jk = 1/mn does not exclude each other.
Does the product JKMN = 1?
(1) (JK)/(MN) = 1 --> JK=MN. The question becomes: does (MN)^2=1. We don't know that. Not sufficient.
(2) J= (1/K) and M = (1/N) --> JKMN = 1/K*K*1/N*N = 1. Sufficient.
Answer: B.
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HermesM11
Current Student
Joined: 09 Oct 2021
Last visit: 08 Jun 2022
Posts: 15
Location: El Salvador
Schools: Simon '24 (WA) Carlson (WL) Broad (A) BU (WL)
GMAT 1: 620 Q48 V27
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Bunuel
But what happens if K=0 or N=0? It would be wrong to assume 1/K*K=1 because of the indetermination. Can someone clarify?
HermesM11
Division by 0 is not allowed: anything/0 is undefined. So, for (2) neither k nor n can be 0 because in this case 1/k and 1/n would be undefined and could not equal to real numbers j and m.
Does this make sense?
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HermesM11
Current Student
Joined: 09 Oct 2021
Last visit: 08 Jun 2022
Posts: 15
Location: El Salvador
Schools: Simon '24 (WA) Carlson (WL) Broad (A) BU (WL)
GMAT 1: 620 Q48 V27
GPA: 3.6
WE:Project Management (Other)
Bunuel
Got it! But it seems that I need to assume every number on GMAT is real, right? The question doesn’t mention it.
Posted from my mobile device
HermesM11
Yes, all numbers used are real numbers by default.
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