Permutations And Combinations Question 305

Question: The number of ways in which 9 persons can be divided into three equal groups is [Orissa JEE 2003]

Options:

A) 1680

B) 840

C) 560

D) 280

Show Answer

Answer:

Correct Answer: A

Solution:

  • Total ways $ =\frac{9!}{{{(3!)}^{3}}}=\frac{9\times 8\times 7\times 6\times 5\times 4}{3\times 2\times 3\times 2}=1680 $ .

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