Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 04 May 2015, 06:19

### 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 June
Open Detailed Calendar

# Q10: A set of numbers has the property that for any number t

Author Message
TAGS:
Manager
Joined: 11 Jan 2007
Posts: 202
Location: Bangkok
Followers: 1

Kudos [?]: 10 [0], given: 0

Q10: A set of numbers has the property that for any number t [#permalink]  04 Jul 2007, 19:56
Q10:
A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I. -3
II. 1
III. 5

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III
_________________

cool

VP
Joined: 10 Jun 2007
Posts: 1465
Followers: 6

Kudos [?]: 133 [0], given: 0

Re: the number of property [#permalink]  04 Jul 2007, 20:37
jet1445 wrote:
Q10:
A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I. -3
II. 1
III. 5

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

C.

If t = -1, t+2 = 1
if t+2 = -1, t = -3

OA?
VP
Joined: 07 Nov 2005
Posts: 1132
Location: India
Followers: 3

Kudos [?]: 29 [0], given: 1

Yes should be D.
-1 could be the first element.
_________________

Trying hard to conquer Quant.

Director
Joined: 09 Aug 2006
Posts: 766
Followers: 1

Kudos [?]: 69 [0], given: 0

Re: the number of property [#permalink]  04 Jul 2007, 22:52
jet1445 wrote:
Q10:
A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I. -3
II. 1
III. 5

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

D.
-1 is in the set only means that -1+2= 1 is in the set, which also means that 1+2=3 is also in the set.
-3 does not have to be in the set since the first number in the set could be -1.
CIO
Joined: 09 Mar 2003
Posts: 464
Followers: 2

Kudos [?]: 34 [0], given: 0

Re: the number of property [#permalink]  05 Jul 2007, 04:27
jet1445 wrote:
Q10:
A set of numbers has the property that for any number t in the set, t + 2 is in the set. If –1 is in the set, which of the following must also be in the set?

I. -3
II. 1
III. 5

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and III

I go with D, for the same reasons above.
Director
Joined: 16 May 2007
Posts: 549
Followers: 2

Kudos [?]: 23 [0], given: 0

Why it cant be E. Why are you assuming that -1 is the first member in the set ? My unanimous choice was E. Am is wrong here ?
CIO
Joined: 09 Mar 2003
Posts: 464
Followers: 2

Kudos [?]: 34 [0], given: 0

trahul4 wrote:
Why it cant be E. Why are you assuming that -1 is the first member in the set ? My unanimous choice was E. Am is wrong here ?

Because the question says, "which of the following MUST be in the set"

We only know for a fact that if a number is in the set, so is 2 plus that number. But that doesn't imply that the number is in the set BECAUSE of a previous number.

We know -1 is there. It implies that 1 is there, which pushes us to 3, which pushes us to 5. Those are "MUSTS". But it doesn't mean that -3 MUST be there.
Similar topics Replies Last post
Similar
Topics:
A set of numbers has the property that for any number t in 3 22 Oct 2007, 19:00
A set of numbers has the property that for any number t in 8 30 May 2007, 08:30
A set of numbers has the property that for any number t in 10 15 Jul 2006, 19:06
A set of numbers has the property that for any number t in 4 29 Dec 2005, 23:38
A set of numbers has the property that for any number t in 27 17 Oct 2005, 06:49
Display posts from previous: Sort by