Class 11

Math

Algebra

Permutations and Combinations

in how many ways can $10$ different beads be arranged to from a necklace so that $4$ beads are always a like?

**Solution: **No. of ways of arranged for 10 beads $=2(10−1)! =29! $But , $4$ beads are a like

Total arrangements $=2×4!9! $