The number of ways in which 21 objects can be grouped into three groups of 8,7 , and 6 objects, ...

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The number of ways in which 21 objects can be grouped into three groups of 8,7 , and 6 objects,
(A) \( \frac{20 !}{8 !+7 !+6 !} \)
(B) \( \frac{21 !}{8 ! 7 !} \)
(C) \( \frac{21 !}{8 ! 7 ! 6 !} \)
(D) \( \frac{21 !}{8 !+7 !+6 !} \)
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