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

3

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6

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5

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None of these

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Solution

The correct option is C $6$
Number of ways so that each person gets atleast one thing (here, exactly one thing) $= n!$
Given, $n! = 720$
$\Rightarrow n = 6$

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