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factorial question!

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Director
Joined: 25 Oct 2008
Posts: 593

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Location: Kolkata,India

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20 Jul 2009, 20:00
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Could someone please explain how 2!=(m-1)!
= 2=m-1
= m=3?
i know the factorial concept as in 5!=5 x 4 x 3 x 2 x 1.The (m-1)! is the part that got me confused.
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http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902

Kudos [?]: 1129 [0], given: 100

Director
Joined: 04 Oct 2008
Posts: 894

Kudos [?]: 286 [1], given: 86

Location: United States (CA)
Concentration: Entrepreneurship, Strategy
Schools: Michigan (Ross) - Class of 2013
GMAT 1: 770 Q50 V44
GPA: 3.3
WE: Project Management (Aerospace and Defense)
Re: factorial question! [#permalink]

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20 Jul 2009, 20:41
1
KUDOS
tejal777 wrote:
Could someone please explain how 2!=(m-1)!
= 2=m-1
= m=3?
i know the factorial concept as in 5!=5 x 4 x 3 x 2 x 1.The (m-1)! is the part that got me confused.

Without knowing the context of your question, I'll have to just take a guess about what you're talking about.

It would appear that you might be describing a circular permutation.

Example: How many ways can you arrange 5 flowers in a circle?
Circular arrangements are always calculated as (n-1)!, where n is equal to the # of items, because the ends touching each other are double counted (ABCDE is the same arrangement as BCDEA in a circular arrangement).

If your question is simply: how can 2! = (m-1)!, then m equals 3.

If that doesn't answer your question, please provide more detail.
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Kudos [?]: 286 [1], given: 86

Manager
Joined: 27 Jun 2008
Posts: 155

Kudos [?]: 34 [0], given: 11

Re: factorial question! [#permalink]

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21 Jul 2009, 02:58
2!=(m-1)!
since the operators are same the expressions have to be same as well, 2=m-1 , m=3

Kudos [?]: 34 [0], given: 11

Manager
Joined: 03 Jul 2009
Posts: 106

Kudos [?]: 93 [0], given: 13

Location: Brazil
Re: factorial question! [#permalink]

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21 Jul 2009, 16:52
Avernusaur remembered the circular permutation! good job. Have you already seen a question with that in GMAT? Could you post please?

Kudos [?]: 93 [0], given: 13

Re: factorial question!   [#permalink] 21 Jul 2009, 16:52
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