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# GMAT prep PT1 - Integer

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Manager
Joined: 04 Dec 2008
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Kudos [?]: 77 [0], given: 2

GMAT prep PT1 - Integer [#permalink]  03 Mar 2009, 06:06
I don't understand why answer is C and not B.
Attachment:
GMAT prep PT1 Q15-cards.doc [63 KiB]

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Senior Manager
Joined: 30 Nov 2008
Posts: 493
Schools: Fuqua
Followers: 10

Kudos [?]: 154 [1] , given: 15

Re: GMAT prep PT1 - Integer [#permalink]  03 Mar 2009, 09:38
1
KUDOS
Since the numbers are small, I went in a rather blunt way. It is given that the product of the two consecutive numbers should be between 15 and 200.

So n(n+1) > 15. The min value possible here is when n = 4.
Also n(n+1) < 200. The max value for n is possible when n = 13.

My Ans will C. 4 and 13.

Lesson Learnt: -

1. BETWEEN does not include the boundary numbers.
2. When explicitly mentioned INCLUSIVE, only then will the boundary numbers be included.

Last edited by mrsmarthi on 06 Mar 2009, 07:35, edited 1 time in total.
Senior Manager
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Kudos [?]: 126 [0], given: 14

Re: GMAT prep PT1 - Integer [#permalink]  04 Mar 2009, 22:04
nice explanation mrsmarthi...........
+1 from my side.......
Manager
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Concentration: Marketing, Strategy
GMAT 1: 650 Q48 V31
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WE: Information Technology (Consulting)
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Kudos [?]: 110 [0], given: 4

Re: GMAT prep PT1 - Integer [#permalink]  06 Mar 2009, 07:06
mrsmarthi wrote:
Since the numbers are small, I went in a rather blunt way. It is given that the product of the two consecutive numbers should be between 15 and 200.

So n(n+1) >= 15. The min value possible here is when n = 4.
Also n(n+1) <= 200. The max value for n is possible when n = 13.

My Ans will C. 4 and 13.

Shouldnt it be this ?
So n(n+1) > 15. The min value possible here is when n = 4.
Also n(n+1) < 200. The max value for n is possible when n = 13.
Senior Manager
Joined: 30 Nov 2008
Posts: 493
Schools: Fuqua
Followers: 10

Kudos [?]: 154 [0], given: 15

Re: GMAT prep PT1 - Integer [#permalink]  06 Mar 2009, 07:39
aalriy,

Thank you for pointing it out. Sometimes, I get confused whether to include the boundary numbers or not. But looks like like when BETWEEN alone is mentioned we should not consider the boundary numbers.

Re: GMAT prep PT1 - Integer   [#permalink] 06 Mar 2009, 07:39
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