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How many necklace of 12 beads each can be made from 18 beads of different colours?

18!
18! x 19!
18!(6 x 24)
18! x 30

Correct Answer: 18!(6 x 24)

Explanation:

Here clock-wise and anti-clockwise arrangements are same.

Hence total number of circular–permutations: $\frac{18 P 12}{2 * 12}$ = $\frac{18!}{6 * 24}$

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