Question

If the number of ways in which $n$ different things can be distributed among $n$ person such that each gets atleast 1 is $720.$ Then, $n$ is equal to

• A. $3$
• B. $6$
• C. $5$
• D. None of these

Answer 1

Answer: (B)

$6$

Number of ways so that each person gets atleast one thing (here, exactly one thing)$=n!$

Given, $n!=720$

$\Rightarrow n=6$