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In how many different ways can 20 different pearls be arranged to form a necklace?

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In how many different ways can 20 different pearls be arranged to form a necklace?

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We know that necklace in the form of a circle, So we need to arrange 

20 pearls in Circle 20 pearls can be arranged by 19! 

Now each pearl have the same neighbour in the clockwise and anticlockwise arrangement 

Total number of arrangement are (19!)/2

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