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Find the number of ways, in which 12 different beads can be arranged to form a necklace.


A) 11! / 2

B) 10! / 2

C) 12! / 2

D) Couldn't be determined

Correct Answer:
A) 11! / 2

Description for Correct answer:
Number of arrangements of beads = (12 -1)! = 11!, but it is not mentioned that either it is clockwise or anti-clockwise. So, required number of arrangements = \( \large\frac{1}{2}(12 - 1)! = \frac{11!}{2} \)

Part of solved Permutation and combination questions and answers : >> Aptitude >> Permutation and combination




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