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A set of numbers has the property that for any number t in

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Manager
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Joined: 16 Oct 2008
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A set of numbers has the property that for any number t in [#permalink]

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New post 30 Oct 2008, 00:25
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

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New post 30 Oct 2008, 01:36
D.
If -1 is in the set, so will 1 be.
If 1 is in the set, so will 3 be.
If 3 is in the set, so will 5 be.

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Re: No. prop Q [#permalink]

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New post 30 Oct 2008, 01:45
scthakur wrote:
D.
If -1 is in the set, so will 1 be.
If 1 is in the set, so will 3 be.
If 3 is in the set, so will 5 be.

We don't know wheter t=-1 or t+2=-1.
So I'd go for E (the sequence being -3, -1, 1, 3, 5)

OA?

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New post 30 Oct 2008, 02:35
These are the GMAT tricks that I'll never understand (and that I find unfair, btw) :arh

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New post 30 Oct 2008, 11:16
still ,I don't understand why it is D and not E

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Re: No. prop Q [#permalink]

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New post 30 Oct 2008, 13:17
linau1982 wrote:
still ,I don't understand why it is D and not E



WE CANt GO BACKWARDS LOGIC....D

WE CANT DEDUCT THAT IF (T+2) IS IN THE SET THEN T IS IN THE SET.

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Re: No. prop Q   [#permalink] 30 Oct 2008, 13:17
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A set of numbers has the property that for any number t in

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