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The answer is 20—if there is a prize for first match, the best position in line is 20th. In the birthday problem, neither of the two people is chosen in advance. By contrast, the probability q n that someone in a room of n other people has the same birthday as a particular person for example, you is given by. Another generalization is to ask for the probability of finding at least one pair in a group of n people with birthdays within k calendar days of each other, if there are d equally likely birthdays.

Thus in a group of just seven random people, it is more likely than not that two of them will have a birthday within a week of each other.


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The expected total number of times a selection will repeat a previous selection as n such integers are chosen equals [15]. In an alternative formulation of the birthday problem, one asks the average number of people required to find a pair with the same birthday.

If we consider the probability function Pr[ n people have at least one shared birthday], this average is determining the mean of the distribution, as opposed to the customary formulation, which asks for the median. The problem is relevant to several hashing algorithms analyzed by Donald Knuth in his book The Art of Computer Programming.

An analysis using indicator random variables can provide a simpler but approximate analysis of this problem. An informal demonstration of the problem can be made from the list of Prime Ministers of Australia , of which there have been 29 as of [update] , in which Paul Keating , the 24th prime minister, and Edmund Barton , the first prime minister, share the same birthday, 18 January. An analysis of the official squad lists suggested that 16 squads had pairs of players sharing birthdays, and of these 5 squads had two pairs: Argentina, France, Iran, South Korea and Switzerland each had two pairs, and Australia, Bosnia and Herzegovina, Brazil, Cameroon, Colombia, Honduras, Netherlands, Nigeria, Russia, Spain and USA each with one pair.

Voracek, Tran and Formann showed that the majority of people markedly overestimate the number of people that is necessary to achieve a given probability of people having the same birthday, and markedly underestimate the probability of people having the same birthday when a specific sample size is given. The reverse problem is to find, for a fixed probability p , the greatest n for which the probability p n is smaller than the given p , or the smallest n for which the probability p n is greater than the given p.

Some values falling outside the bounds have been colored to show that the approximation is not always exact. A related problem is the partition problem , a variant of the knapsack problem from operations research. Some weights are put on a balance scale ; each weight is an integer number of grams randomly chosen between one gram and one million grams one tonne. The question is whether one can usually that is, with probability close to 1 transfer the weights between the left and right arms to balance the scale. In case the sum of all the weights is an odd number of grams, a discrepancy of one gram is allowed.

If there are only two or three weights, the answer is very clearly no; although there are some combinations which work, the majority of randomly selected combinations of three weights do not. If there are very many weights, the answer is clearly yes. The question is, how many are just sufficient? That is, what is the number of weights such that it is equally likely for it to be possible to balance them as it is to be impossible?

Often, people's intuition is that the answer is above Most people's intuition is that it is in the thousands or tens of thousands, while others feel it should at least be in the hundreds.

The correct answer is The reason is that the correct comparison is to the number of partitions of the weights into left and right. Arthur C. Clarke 's novel A Fall of Moondust , published in , contains a section where the main characters, trapped underground for an indefinite amount of time, are celebrating a birthday and find themselves discussing the validity of the birthday problem. As stated by a physicist passenger: "If you have a group of more than twenty-four people, the odds are better than even that two of them have the same birthday.

The reasoning is based on important tools that all students of mathematics should have ready access to.

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The birthday problem used to be a splendid illustration of the advantages of pure thought over mechanical manipulation; the inequalities can be obtained in a minute or two, whereas the multiplications would take much longer, and be much more subject to error, whether the instrument is a pencil or an old-fashioned desk computer. What calculators do not yield is understanding, or mathematical facility, or a solid basis for more advanced, generalized theories. From Wikipedia, the free encyclopedia. For yearly variation in mortality rates, see birthday effect.

For the mathematical brain teaser that was asked in the Math Olympiad, see Cheryl's Birthday. Main article: Birthday attack. In particular, many children are born in the summer, especially the months of August and September for the northern hemisphere [1] , and in the U. In Sweden 9. See also: Murphy, Ron. Retrieved International Journal of Epidemiology.

These factors tend to increase the chance of identical birth dates, since a denser subset has more possible pairs in the extreme case when everyone was born on three days, there would obviously be many identical birthdays. If you were born on the 2nd or 20th any month, your primary birth path is an idealist. Number: 5. If you were born on the 5th, 14th, or 23rd of any month, your primary birth path is opportunist. If you were born on the 6th, 15th or 24th of any month, your primary birth path is caregiver. Martin Luther King Jr. If you were born on the 7th, 16th or 25th of any month, your primary birth path is seeker.

Eckhart Tolle: Born Feb. Billy Graham: Born Nov. If you were born on the 8th, 17th, or 26th of any month, your primary birth path is affluent. Bernie Sanders: Born Sept. If you were born on the 9th, 18th, or 27th of any month, your primary birth path is philosopher. John Lennon: Born Oct. Some Muslims migrating to the United States adopt the custom of celebrating birthdays, especially for children, but others resist.


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There is also a great deal of controversy regarding celebrating Mawlid the anniversary of the birth of Muhammad. While a section of Islam strongly favours it, [34] others decry such celebrations, terming them as out of the scope of Islam. That age is reckoned whenever Janma Nakshatra of the same month passes. Hindus regard death to be more auspicious than birth since the person is liberated from the bondages of material society. Many monasteries celebrate the anniversary of Buddha's birth, usually in a highly formal, ritualized manner.

They treat Buddha's statue as if it was Buddha himself, as if he were alive; bathing, and "feeding" him. Sikhs celebrate the anniversary of the birth of Guru Nanak. In North Korea , people do not celebrate birthdays on July 8 and December 17 because these were the dates of the deaths of Kim Il-sung and Kim Jong-il , respectively. More than , North Koreans celebrate displaced birthdays on July 9 or December 18 to avoid these dates. A person born on July 8 before may change their birthday, with official recognition.

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June Learn how and when to remove this template message. Main article: Name day. Main article: Buddha's birthday. Retrieved on Statistics New Zealand. Retrieved 2 October The New York Times. Retrieved 21 November Retrieved Classical Antiquity. Origins of Chinese People and Customs p.

Asiapac Books Singapore. Just Asked. Archived from the original on Flatbush Jewish Journal. Birthdays also have a long-standing and an intimate link with astrology and the horoscope.