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The expected number of people needed until every birthday is achieved is called the Coupon collector's problem. It can be calculated by nH n, where H n is the n th harmonic number. For 365 possible dates (the birthday problem), the answer is 2365.
The probability that 365 people have distinct birthdays is 365!/365^365. (1/365! is the probability that you take 365 people with distinct birthdays and, picking them one at a time, correctly pick them in birthday order). Let's work with smaller numbers: assume a 3-sided coin (it's more interesting than a two-sided, but the numbers are small).
Birth rate. Birth rate, also known as natality, is the total number of live human births per 1,000 population for a given period divided by the length of the period in years. [ 1] The number of live births is normally taken from a universal registration system for births; population counts from a census, and estimation through specialized ...
In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. ยง 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...
Happy birthday! Stay golden, girl. Your friendship means the world to me. Thank you for being YOU. Happy birthday, friend. True friends are there through the good times and the bad.
With so many amazing people sending love my way, I don't even need to make a birthday wish. Thank you to everyone who sent me sweet messages today! My birthday was so special and your message just ...
A voicemail from a child wishing his mother a happy birthday. In certain parts of the world, an individual's birthday is celebrated by a party featuring a specially made cake. It may be decorated with lettering and the person's age, or studded with the same number of lit candles as the age of the individual.
Send these birthday wishes to your best friend, mom, dad, brother, sister or special someone. Find a mix of funny, heartfelt and simple messages for their card.