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

11 !/2
10 !/2
12 !/2
Couldn't be determined

Correct Answer: 11 !/2

Explanation:

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

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