I am re calculating it right now.

By the way, just want to know if you have learnt survival model before?]]>

That checks with what I got for 10. For 100, I am getting 48.505

]]>I will get it for you, in the meantime to check what did you get for 10?

]]>As far as my understanding goes, it computes the number of ways you can give out n names to n people without any of them having their own name.

That is the number of derangements which is always an integer. Your sum there is not always an integer.

]]>Summation from j= 0 to n of (-1)^j/j! in the numerator is not getting into my head.

As far as my understanding goes, it computes the number of ways you can give out n names to n people without any of them having their own name.

Why do we need to multiply the summation in the numerator with P(no one getting drunk)?

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