At least two people have the same birthday

Hint: your approach is a good one. What is the chance if there are only two people? Three?


You can read all about this famous problem here to learn how to calculate the probability that at least two of $n$ people share a birthday. In your case at least two of $85$ people will share a birthday with a probability of approximately $99.998\%$.

Tags:

Probability

Permutations

Birthday

Related

Zero-dimensional ideals in polynomial rings Finding poles, indicating their order and then computing their residues Prove $\left(\frac{2}{5}\right)^{\frac{2}{5}}<\ln{2}$ Find all functions $f$ such that $(x+y)f(x)+f(y^2)=(x+y)f(y)+f(x^2)$ How long will it take Marie to saw another board into 3 pieces? In how many different ways can we place $8$ identical rooks on a chess board so that no two of them attack each other? How to enumerate subgroups of each order of $S_4$ by hand An alternative description of the first Stiefel-Whitney class Fit a equilateral triangle on three arbitrary parallel lines with an edge and compass Prove or disprove that the interior and the boundary of a connected set are connected. Class group of $k[x,y,z,w]/(xy-zw)$ Interesting phenomenon with the $\zeta(3)$ series

Recent Posts