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Find the number of ways, in which 12 different beads can be arranged to form a necklace .
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- 11 !/2
- 10 !/2
- 12 !/2
- Couldn't be determined
- None of the above
Correct Option: A
Number of arrangements of beads = (12 - 1) !, but it is not mentioned that either it is clockwise or anti - clockwise .
So, required number of arrangements = [(12 - 1)! ] / 2 = 11 !/2
