necklaces
Probability
Level
5
How many necklaces can be formed by joining 30 together green beads and 3 red beads?
The answer is 91.
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1 solution
This is one of the best problems, I did here.
The crux of the problem lies in considering the fact that, we have to count only those cases where the necklace remains a unique piece even on geometric transformation(that includes rotation, flipping etc.)