Question

If the best and the worst paper never appear together, then six examination papers can be arranged in how many ways.

• A. 120
• B. 480
• C. 240
• D. None of these

Answer 1

Answer: (B)

480

Answer 2

If the best and the worst appear always together, the number of ways $5\mspace{6mu}!\mspace{6mu} \times 2$. Therefore required number of ways $\mspace{6mu} 6\mspace{6mu}!\mspace{6mu} - 5\mspace{6mu}!\mspace{6mu} \times 2 = 480$.