|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
hideyoshi
Joined: 09 Feb 2010
Last visit: 05 Dec 2020
Posts: 72
Given Kudos: 18
Affiliations: Scrum Alliance
Location: United States (MI)
Concentration: Strategy, General Management
Schools: Ross Weekend"19 Booth PT '20 (M)
GMAT 1: 600 Q48 V25
GMAT 2: 710 Q48 V38
WE:Information Technology (Retail: E-commerce)
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
72% (01:00) correct
28%
(00:51)
wrong
based on 69
sessions
History
Date
Time
Result
Not Attempted Yet
If \(d\) is an integer, is \(d = d^3\)?
1) \(d < 1\)
2) \(d < 0\)
Source: Prep4GMAT iOS app
1) \(d < 1\)
2) \(d < 0\)
Source: Prep4GMAT iOS app
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
ENGRTOMBA2018
Joined: 20 Mar 2014
Last visit: 01 Dec 2021
Posts: 2,315
Given Kudos: 816
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE:Engineering (Aerospace and Defense)
Products:
03 Sep 2015, 19:09
Kudos
Bookmarks
hideyoshi
for \(d=d^3\) ---> \(d(d^2-1)\) = 0 ---> d(d+1)(d-1)=0 ---> for \(d=d^3\), d = 0 or 1 or -1
Per statement 1, d<1 , so if d = 0 or -1, the answer is "yes" to "is \(d=d^3\)" but if d=-2, the answer is "no" to "is \(d=d^3\)". Statement is NOT sufficient.
Per statement 2, d<0 , so if d = -1, the answer is "yes" to "is \(d=d^3\)" but if d=-2, the answer is "no" to "is \(d=d^3\)". Statement is NOT sufficient.
Combining, you get again d<0 and thus both statements together are still not sufficient. E is the correct answer.
20 Jan 2020, 08:02
Kudos
Bookmarks
hideyoshi
Given: \(d\) is an integer
Target question: Is \(d = d^3\)?
When I SCAN the two statements, they both feel insufficient, AND I’m pretty sure I can identify some cases with conflicting answers to the target question. So, I’m going to head straight to……
Statements 1 and 2 combined
There are several values of d that satisfy BOTH statements. Here are two:
Case a: d = -1. Here, \(d = d^3\) becomes \(-1 = (-1)^3\), which is true. In this case, the answer to the target question is YES, d = d³
Case b: d = -2. Here, \(d = d^3\) becomes \(-2 = (-2)^3\), which is NOT true. In this case, the answer to the target question is NO, d does NOT equal d³
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
