 By contrast, the probability that someone in a room of other people has the same birthday as a "particular" person (for example, you) is given by

and for general by

In the standard case of , substituting gives about 6.1%, which is less than 1 chance in 16.For a greater than 50% chance that one person in a roomful of people has the same birthday as "you", would need to be at least 253.This number is significantly higher than