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# How many integers are there between, but not including,

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Manager
Joined: 25 Dec 2010
Posts: 83
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Kudos [?]: 93 [0], given: 2

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

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09 Sep 2011, 06:32
00:00

Difficulty:

35% (medium)

Question Stats:

67% (01:22) correct 33% (01:16) wrong based on 15 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.
Math Forum Moderator
Joined: 20 Dec 2010
Posts: 2013
Followers: 163

Kudos [?]: 1829 [1] , given: 376

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09 Sep 2011, 08:43
1
KUDOS
shashankp27 wrote:
Is it not possible that integers might repeat in between a and b? Based on this thought , i chose E .

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.
_________________
Math Forum Moderator
Joined: 20 Dec 2010
Posts: 2013
Followers: 163

Kudos [?]: 1829 [0], given: 376

### Show Tags

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"
_________________
Manager
Joined: 25 Dec 2010
Posts: 83
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Kudos [?]: 93 [0], given: 2

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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 .
Manager
Joined: 25 Dec 2010
Posts: 83
Followers: 0

Kudos [?]: 93 [0], given: 2

### Show Tags

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 .

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.
Re: Number of integers   [#permalink] 09 Sep 2011, 08:49
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