Necklace / bracelet (rotations and reflections) (Circular arrangements of n distinct beads when rotation and reflection)
jee-mainjee-advanced
Circular arrangements of n distinct beads when rotation and reflection are equivalent: (n−1)!/2 for n≥3
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Distinct beads |
When to use this
n≥3 for /2 after rotation quotient; n=1,2 are small cases checked separately.