Q. The number of ways that 8 beads of different colures be string as a necklace, is
A) 2520
B) 2880
C) 5040
D) 4320
Explanation
(a)
8 different beads can be arranged in circular form in $(8 - 1)! = 7!$ ways. Since, there is no distinction between the clockwise and anticlockwise arrangement. So, the required number of arrangements$= \frac{7!}{2} = 2520$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.