How many necklaces can be composed of five white and two black beads?
1
Expert's answer
2010-06-22T05:36:21-0400
Black beads divide white beads into 2 groups (one of these two groups can contain 0 beads). The kind of a necklace is completely determined by the number of beads in the smaller group. This number can be 0, 1 or 2.
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