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Q)

The no. of ways in which 20 different pearls of two colours can be set alternatively on a necklace, there being 10 pearls of each colour, is ?

$\begin{array}{1 1} 9!.10! \\ 5.(9!)^2 \\ (9!)^2 \\ 5. (10 !)^2 \end{array}$

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