I am trying to figure out how many ways 20 beads can be placed around a necklace, but i'm not really sure where to start. Could someone give me a hint on this? my thought is that it is 20! / 20
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If we arrange twenty persons around a circular table, that can be done in ways. But with beads on a necklace we can view it from two sides. That is to say if we had three beads: red, green, & blue. There would be only one necklace. is the same as
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