Tuesday, May 5, 2009

Problem 30 - GMAT Combinatorics

In how many different arrangements can six trees be planted on the circumference of a circular garden if two arrangements are considered different when the positions of the trees are different relative to those of the others?

A) 720
B) 180
C) 160
D) 120
E) 60
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4 comments:

  1. AnonymousJune 15, 2009 at 7:59 PM

    Circular arrangmenents no restrictions, right? So 5!? 120?

    ReplyDelete
  2. UnknownSeptember 29, 2009 at 11:25 PM

    120 ??

    ReplyDelete
  3. AnonymousNovember 9, 2009 at 8:56 AM

    formula for circular arrangements is (n-1)! = (6-1)! = 5!

    ReplyDelete
  4. AnonymousApril 4, 2010 at 12:41 PM

    It is 60 folks .. here anticlockwise and clockwise are not counted twice but only once .. formula 1/2(n-1)!

    ReplyDelete

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