Source: Official Guide for the GMAT 13th Ed. Data Sufficiency; #67 Official Guide for the GMAT 2015 14th Ed. Data Sufficiency; #67

1

What is the value of integer n?

What is the value of integer n?

2 Explanations

1

Felipe Levi Gurgel

I didnt understand something.

1- result of n(n+1)= 6 would be N^2 + N= 6 and the only result possible here to come to 6 would be 2^2 + 2 = 6, than n=2.

Where is it wrong???

Dec 23, 2016 • Comment

Sam Kinsman, Magoosh Tutor

Hi Felipe,

Actually, n could also be equal to -3. That would work as well.

We can find this by factoring:

N^2 + N= 6
N^2 + N - 6 = 0
(N + 3) (N - 2) = 0

So N can be either 2 or -3.

Dec 27, 2016 • Reply

1

Gravatar Mike McGarry, Magoosh Tutor

Jan 4, 2014 • Comment

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Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

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Official Guide for the GMAT 12th Ed.

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Section 6.3 Data Sufficiency

Section 6.3 Data Sufficiency

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