Question

The number of ways in which 9 persons can be divided into three equal groups is

• A. 1680
• B. 840
• C. 560
• D. 280

Answer 1

Answer: (D)

280

Answer 2

Total ways = $\frac{9!}{(3!)^{3}} = \frac{9 \times 8 \times 7 \times 6 \times 5 \times 4}{3 \times 2 \times 3 \times 2 \times 3 \times 2}$= 280.`