The number of ways in which 20 different...

The 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, is

`9!xx10!`

`5(9!)^(2)`

`(9!)^(2)`

`(10!)^(2)`

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VMC MODULES ENGLISH-PERMUTATION & COMBINATION-LEVEL-1

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