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

A) 720

B) 180

C) 160

D) 120

E) 60

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

ReplyDelete120 ??

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

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

ReplyDelete