Wednesday, 25 October 2017

combinatorics - What is the probability to get each side at least once on n throws of fair dice?

Let's say I have n fair (six-sided) dice (n>=6) and I want to figure out the probability of getting each side at least once. I figured out a formula through elementary combinatorial reasoning: \frac{6!\cdot\binom{n}{6}\cdot6^{n-6}}{6^n}



First, of all, is this formula correct?



Second, somewhere I read that I could do this with the sieve formula. How do I use the sieve formula for this one?

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