Question

If the bwest 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:

d)None of these (6! - 5!=600)

Step-by-step explanation:

According to permutation, 'n' things can be arranged among themselves in n! ways, so 6 papers can be arranged among themselves in 6! ways.

Considering 2 papers as a unit, total arrangements of 5 papers=5!

If 2 papers are not kept together total arrangements =6!-5!= 600