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Number of necklaces of 8 coloured stoned made by 15 coloured stones.

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Number of neckless of 8 coloured stone made by 15 coloured stone 

= 15C\(\cfrac{15\times14\times13\times12\times11\times10\times9\times8!}{8!\times7\times6\times5\times4\times3\times2\times1}\)

= 6435

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