A) 1680
B) 840
C) 560
D) 280
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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