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ITT, we list our birthdays.

Started by Mighty Oracle, April 11, 2010, 12:05:43 AM

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JackO

Quote from: tenck5k on April 13, 2010, 03:39:44 PM
And yea, there are only 365 days in the year, so unless your day is a bit rarer (leap year for example) then you are pretty likely to bump into another with the same date of birth.

Well thats not quite the point...the way you explain it makes it sound like there's a 1/365 chance of having the same birthday.

If you read the wiki article i linked to it explains, the principle.

Just a small demonstration of this would be, Imagine 5 people, lettered A-E, who have randomly picked birthdays, in the year.

For 2 of them to have the same birthday, the pairs could be

AB, AC, AD, AE, BC, BD, BE, CD, CE, DE

this makes a 10/365 chance (i think...someone mathsy correct me if i;ve gone wrong)

which will increase with the number of people (and consequently pairs) you have, up to a totally certain chance at 367 people. (counting leap years)


So if you think about it as pairs of people, its really not that amazing at all. 


Kosetsu

November 21st is my birthday. 20 years old currently.


tenck5k

convenient, but I must not have entered my birthday, or made it private, cuz it doesn't show up XD

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