Number of ways in which 20 different pearls of two colours can be set alternately on a necklace, there being 10 pearls of each colour.

Number of ways in which 20 different pearls of two colours can be set

1.	Number of ways in which 20 different pearls of two colours can be set alternately on a necklace, there being 10 pearls of each colour.
A.	\[6\times {{(9!)}^{2}}\]
B.	12!
C.	\[4\times {{(8!)}^{2}}\]
D.	\[5\times {{(9!)}^{2}}\]
Answer» E.

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Number of ways in which 20 different pearls of two colours can be set alternately on a necklace, there being 10 pearls of each colour.

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