GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Feb 2019, 19:47

### 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

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT Prep Hour

February 20, 2019

February 20, 2019

08:00 PM EST

09:00 PM EST

Strategies and techniques for approaching featured GMAT topics. Wednesday, February 20th at 8 PM EST

February 21, 2019

February 21, 2019

10:00 PM PST

11:00 PM PST

Kick off your 2019 GMAT prep with a free 7-day boot camp that includes free online lessons, webinars, and a full GMAT course access. Limited for the first 99 registrants! Feb. 21st until the 27th.

# Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0

Author Message
TAGS:

### Hide Tags

Manager
Joined: 10 Feb 2011
Posts: 107
Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

Updated on: 23 Jul 2018, 02:32
1
3
00:00

Difficulty:

35% (medium)

Question Stats:

63% (01:18) correct 37% (01:25) wrong based on 240 sessions

### HideShow timer Statistics

Is x less than y?

(1) x - y + 1 < 0
(2) x - y - 1 < 0

Originally posted by banksy on 26 Feb 2011, 15:40.
Last edited by Bunuel on 23 Jul 2018, 02:32, edited 2 times in total.
Edited the question and added the OA.
Math Expert
Joined: 02 Sep 2009
Posts: 53020
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

26 Feb 2011, 15:47
2
Is x less than y?

Is $$x<y$$? --> is $$x-y<0$$?

(1) x-y+1<0 --> $$x-y<-1$$. Sufficient.
(2) x-y-1<0 --> $$x-y<1$$. Not sufficient.

_________________
Manager
Status: Can't give up
Joined: 20 Dec 2009
Posts: 224
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

28 Feb 2011, 17:32
yes A it is

1.) x-y<-1 This is satisfied when x<y

2.) x-y<+1 Not sufficient

example x=1.5 and y=1; 1.5-1 < 1
x = - 2 and y= -1; -2 - (-1) < 1

A it is.
Manager
Joined: 05 Jul 2012
Posts: 64
Location: India
Concentration: Finance, Strategy
GMAT Date: 09-30-2012
GPA: 3.08
WE: Engineering (Energy and Utilities)
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

06 Aug 2012, 18:08
gagan_g2k wrote:
Is x less than y?
(1) x-y+1<0
(2) x-y-1<0

The official answer is a but as per my solution it should be d.

That's a very easy trap to fall for, I to fell for it.
Added the two inequalities and got x-y <0 and condluded both are necessary
But if you look at x-y +1 < 0 this means that x+y < -1
which means that X-Y < 0 as -1 < 0 , so we can get the answer from one only.

Now looking at 2) X-Y -1< 0 this means that x-y < 1 which doesn,t clearly mean that x<y as something less than 1 can be positive and negative both.

Damn i need more practice !
Director
Joined: 22 Mar 2011
Posts: 599
WE: Science (Education)
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

06 Aug 2012, 21:26
1
1
gagan_g2k wrote:
Is x less than y?
(1) x-y+1<0
(2) x-y-1<0

The official answer is a but as per my solution it should be d.

(1) $$x-y+1<0$$ implies $$x-y<-1<0$$, which means $$x-y<0$$ or $$x<y$$.
Hence sufficient.

(2) Take $$x = y = 0$$ for which obviously x is not less than y, but (2) holds. For x = 0 and y = 1, (2) still holds, but now x < y.
Not sufficient.

_________________

PhD in Applied Mathematics
Love GMAT Quant questions and running.

Retired Moderator
Joined: 26 Nov 2012
Posts: 592
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

15 Jul 2016, 00:51
Silviax wrote:
Is x>y?

Statement 1: x-y-1>0

Statement 2: x-y+1>0

Given x>y

Then we need to find x-y > 0 ?

Stat 1: x-y-1>0
=> x-y > 1...Sufficient.

Stat 2: x-y + 1 > 0.
=> x-y > -1... Insufficient ( Since we need to seek x-y > 0 )

Manager
Joined: 14 Jun 2012
Posts: 111
GMAT 1: 560 Q36 V31
GMAT 2: 580 Q39 V31
GMAT 3: 630 Q41 V35
GPA: 4
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

15 Jul 2016, 01:01
The way you explained makes a lot more sense than the official explanation of Magoosh.

I can now see that statement 1 is sufficient by itself.
Thanks!
Senior DS Moderator
Joined: 27 Oct 2017
Posts: 1207
Location: India
GPA: 3.64
WE: Business Development (Energy and Utilities)
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0  [#permalink]

### Show Tags

07 Jan 2019, 06:02

Project DS Butler: Day 62: Data Sufficiency (DS124)

Bumping for DS butler Projec
_________________
Re: Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0   [#permalink] 07 Jan 2019, 06:02
Display posts from previous: Sort by

# Is x less than y? (1) x - y + 1 < 0 (2) x - y - 1 < 0

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.