The solution is something like 22 or 23 people, I can't remember right now.

You must calculate for what $\,n\,$ you get

$$\prod_{k=1}^\infty\left(1-\frac{n}{365}\right)\geq\frac{1}{2}$$

Well, now just solve the above...(there's a way to simplify it using the binomial coefficient)

The solution is something like 22 or 23 people, I can't remember right now.

You must calculate for what $\,n\,$ you get

$$\prod_{k=1}^n\left(1-\frac{k}{365}\right)\geq\frac{1}{2}$$

Well, now just solve the above...(there's a way to simplify it using the binomial coefficient)