The number of ways in which 9 person can be divided into three equal group is

1680

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840

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560

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280

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Solution

The correct option is D 280
Total person $= 9$
They have to be divided into three equal groups $9$ persons can be arrange in $9!$ ways and they are divided equally so
Number of ways $= \frac{9!}{3! 3! 3! 3!}$
$= 280$ .

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