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How many integers are there between, but not including,

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Manager
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Joined: 25 Dec 2010
Posts: 81

Kudos [?]: 108 [0], given: 2

How many integers are there between, but not including, [#permalink]

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New post 09 Sep 2011, 06:32
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (00:23) correct 31% (01:16) wrong based on 16 sessions

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How many integers are there between, but not including, integers a and b ?

(1) b - a = 8

(2) There are 7 integers between, but not including, a - 1 and b - 1.
[Reveal] Spoiler: OA

Last edited by shashankp27 on 09 Sep 2011, 08:50, edited 1 time in total.

Kudos [?]: 108 [0], given: 2

Math Forum Moderator
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Joined: 20 Dec 2010
Posts: 1965

Kudos [?]: 2097 [0], given: 376

Re: Number of integers [#permalink]

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New post 09 Sep 2011, 06:41
shashankp27 wrote:
How many integers are there between, but not including, integers a and b ?

(1) b - a = 8

(2) There are 7 integers between, but not including, a - 1 and b - 1.


Sol:

We know that both a and b are integers.

(1) b-a=8
The numbers of integers between two integers not including the extremes will be:
b-a-1=8-1=7
Sufficient.

(2)b-1-(a-1)-1=7
b-a-1=7
Sufficient.

Ans: "D"
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~fluke

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Kudos [?]: 2097 [0], given: 376

Manager
Manager
avatar
Joined: 25 Dec 2010
Posts: 81

Kudos [?]: 108 [0], given: 2

Re: Number of integers [#permalink]

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New post 09 Sep 2011, 08:24
fluke wrote:
shashankp27 wrote:
How many integers are there between, but not including, integers a and b ?

(1) b - a = 8

(2) There are 7 integers between, but not including, a - 1 and b - 1.


Sol:

We know that both a and b are integers.

(1) b-a=8
The numbers of integers between two integers not including the extremes will be:
b-a-1=8-1=7
Sufficient.

(2)b-1-(a-1)-1=7
b-a-1=7
Sufficient.

Ans: "D"



Is it not possible that integers might repeat in between a and b? Based on this thought , i chose E .
Am i missing something ? Please advise.

Kudos [?]: 108 [0], given: 2

1 KUDOS received
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 1965

Kudos [?]: 2097 [1], given: 376

Re: Number of integers [#permalink]

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New post 09 Sep 2011, 08:43
1
This post received
KUDOS
shashankp27 wrote:
Is it not possible that integers might repeat in between a and b? Based on this thought , i chose E .
Am i missing something ? Please advise.


For this question,

"How many integers are there between"

is interpreted as

"How many different integers are there between"

What you said might be true for few of the sets questions. Here, a and b are merely two integers on a number line.
_________________

~fluke

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 2097 [1], given: 376

Manager
Manager
avatar
Joined: 25 Dec 2010
Posts: 81

Kudos [?]: 108 [0], given: 2

Re: Number of integers [#permalink]

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New post 09 Sep 2011, 08:49
fluke wrote:
shashankp27 wrote:
Is it not possible that integers might repeat in between a and b? Based on this thought , i chose E .
Am i missing something ? Please advise.


For this question,

"How many integers are there between"

is interpreted as

"How many different integers are there between"

What you said might be true for few of the sets questions. Here, a and b are merely two integers on a number line.



Thanks , will keep a note of this one.

Kudos [?]: 108 [0], given: 2

Re: Number of integers   [#permalink] 09 Sep 2011, 08:49
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How many integers are there between, but not including,

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