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With M = 365 days in a year, the average number of people required to find a pair with the same birthday is n = 1 + Q(M) ≈ 24.61659, somewhat more than 23, the number required for a 50% chance. In the best case, two people will suffice; at worst, the maximum possible number of M + 1 = 366 people is needed; but on average, only 25 people are ...
The correct answer, of course, is "infinite", as there is nothing preventing, for example, everyone from being born on the same day. But given the number of people, what is the probability of every day in the year being someone's birthday? For 1 to 364 people, it is 0, i.e. such a thing is impossible.
Happy birthday! This year, Leap Day is Thursday, Feb. 29, 2024. If you were born on Leap Day 1924, you would be 100 years old or 25 in Leap Day years.
Day-item: The total, thus reached, must be corrected, by deducting "1" (first adding 7, if the total be "0"), if the date be January or February in a leap year, remembering that every year, divisible by 4, is a Leap Year, excepting only the century-years, in 'New Style', when the number of centuries is not so divisible (e.g. 1800).
The 10 possible dates the old woman gives you, Barbara, and Charles are listed below, in chronological order. Charles: “I’m not sure when her birthday is, but I am sure that Barbara can’t ...
In some situations, March 1 is used as the birthday in a non-leap year since it is the day following February 28. Technically, a leapling will have fewer birthday anniversaries than their age in years. This phenomenon is exploited when a person claims to be only a quarter of their actual age, by counting their leap-year birthday anniversaries only.
Wikipedia uses several templates that self-update every day to keep date and age information current. These are very useful for a dynamic online encyclopedia and save users from having to regularly update that kind of information. However, when using this kind of template, a few things should be kept in mind.
Note: The template may not calculate the age correctly if a full date (month, day, year) is not provided. For example, a person who was born in 1941 could be either 83 or 84, depending on whether they have reached their birthday in the current year: {{Birth-date and age|1941}} → 1941 () (age 84)