Question

The number of ways to arrange six examination papers so that best and the worst paper appear together, are :-

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

Answer 1

The correct option is C $240$

$6$ paper can be arranged in $6!$ ways

The total ways in which best and worst paper can come together

Now let the best and the worst paper be $1$ unit

so now total we have $5$ papers so $5!$

also the best and worst paper can be arranged amongst themselves in $2$ ways

so total ways in which best and worst paper can come together is $5!\times 2$ ways

= 240 ways