# Let's see how many days of the year we can fill with Doper Birthdays. **URL:** \ **Category:** Miscellaneous and Personal Stuff I Must Share\ **Created:** [October 7, 2005, 9:47pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244 "2005-10-07T21:47:32Z")\ **Posts on this page:** 20\ **Page:** 18
**Author:** ![kambuckta](https://avatars.discourse-cdn.com/v4/letter/k/53a042/32.png) [@kambuckta](https://boards.straightdope.com/u/kambuckta)\ **Post date:** [October 13, 2005, 4:08am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/341 "2005-10-13T04:08:17Z")
Seven pages and nobody’s taken **August 6th** yet? T’riffic. I’ts all mine then. ---
**Author:** ![Kid\_A\_1](https://avatars.discourse-cdn.com/v4/letter/k/ed8c4c/32.png) [@Kid\_A\_1](https://boards.straightdope.com/u/Kid_A_1)\ **Post date:** [October 13, 2005, 4:13am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/342 "2005-10-13T04:13:49Z")
Nice. I have **May 2nd** all to myself. ---
**Author:** ![Chance\_the\_Gardener](https://avatars.discourse-cdn.com/v4/letter/c/eada6e/32.png) [@Chance\_the\_Gardener](https://boards.straightdope.com/u/Chance_the_Gardener)\ **Post date:** [October 13, 2005, 4:20am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/343 "2005-10-13T04:20:41Z")
**September 26** That oughta help you out. Besides me, that day saw into this world George Gershwin, John Coltrane, T.S. Eliot, Olivia Newton John, Jack LaLanne, Serena Williams and Jefferson Starship guitarist Craig Chaquico. ---
**Author:** ![Otanabi](https://avatars.discourse-cdn.com/v4/letter/o/b9e5f3/32.png) [@Otanabi](https://boards.straightdope.com/u/Otanabi)\ **Post date:** [October 13, 2005, 11:17am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/344 "2005-10-13T11:17:08Z")
And I share this date with Michael Douglas \*and \* Catherine Zeta-Jones. ---
**Author:** ![TellMeI\_mNotCrazy](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/tellmei_mnotcrazy/32/3419_2.png) [@TellMeI\_mNotCrazy](https://boards.straightdope.com/u/TellMeI_mNotCrazy)\ **Post date:** [October 13, 2005, 11:27am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/345 "2005-10-13T11:27:33Z")
I am a little surprised that in 7 pages of posts, not one of my 3 children’s birthdays has been taken yet. ---
**Author:** ![Capt.Ridley\_s\_Shooting\_Party](https://avatars.discourse-cdn.com/v4/letter/c/cc9497/32.png) [@Capt.Ridley\_s\_Shooting\_Party](https://boards.straightdope.com/u/Capt.Ridley_s_Shooting_Party)\ **Post date:** [October 13, 2005, 2:33pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/346 "2005-10-13T14:33:51Z")
Another November 20th, here. ---
**Author:** ![Avarie537](https://avatars.discourse-cdn.com/v4/letter/a/48db29/32.png) [@Avarie537](https://boards.straightdope.com/u/Avarie537)\ **Post date:** [October 13, 2005, 4:55pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/347 "2005-10-13T16:55:33Z")
> [@PinkMarabou](#): > > I never thought that I would know many people who share my birthday. One of my closest friends shares it and another friend’s son was born on May 1st (which ironically she named him the same first name as my husband!). Small world. But I guess with only 365 days in a year, someone is bound to share your birthday! > > Oh yes, I lurve pink!! People at work ask me if I’m feeling okay on the days I don’t wear pink. Yeah, yeah, I can be very girly. > > I’m glad I have a birthday-twin here at the 'dope! I thought I would be the only one. I’m a 1978, how 'bout you? 1980 - Not too far apart! 😃 ---
**Author:** ![Redwing](https://avatars.discourse-cdn.com/v4/letter/r/dfb087/32.png) [@Redwing](https://boards.straightdope.com/u/Redwing)\ **Post date:** [October 13, 2005, 5:12pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/348 "2005-10-13T17:12:24Z")
Add May 23rd for me. ---
**Author:** ![Pixisis](https://avatars.discourse-cdn.com/v4/letter/p/f17d59/32.png) [@Pixisis](https://boards.straightdope.com/u/Pixisis)\ **Post date:** [October 13, 2005, 5:58pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/349 "2005-10-13T17:58:51Z")
Please add April 19 for me. ---
**Author:** ![Eliphalet](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/eliphalet/32/9563_2.png) [@Eliphalet](https://boards.straightdope.com/u/Eliphalet)\ **Post date:** [October 13, 2005, 6:59pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/350 "2005-10-13T18:59:42Z")
'nother June 5 for me!! Eli ---
**Author:** ![Edward\_The\_Head](https://avatars.discourse-cdn.com/v4/letter/e/ce73a5/32.png) [@Edward\_The\_Head](https://boards.straightdope.com/u/Edward_The_Head)\ **Post date:** [October 13, 2005, 7:52pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/351 "2005-10-13T19:52:41Z")
June 21 ---
**Author:** ![vertizontal](https://avatars.discourse-cdn.com/v4/letter/v/ad7895/32.png) [@vertizontal](https://boards.straightdope.com/u/vertizontal)\ **Post date:** [October 13, 2005, 9:17pm UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/352 "2005-10-13T21:17:57Z")
August 11th ---
**Author:** ![PapSett](https://avatars.discourse-cdn.com/v4/letter/p/ecc23a/32.png) [@PapSett](https://boards.straightdope.com/u/PapSett)\ **Post date:** [October 14, 2005, 12:13am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/353 "2005-10-14T00:13:14Z")
> [@GorillaMan](#): > > 18th June I have a Doper Twin too ! Another June 18 here . ---
**Author:** ![gruver](https://avatars.discourse-cdn.com/v4/letter/g/57b2e6/32.png) [@gruver](https://boards.straightdope.com/u/gruver)\ **Post date:** [October 14, 2005, 12:16am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/354 "2005-10-14T00:16:18Z")
march 24 ---
**Author:** ![DMark](https://avatars.discourse-cdn.com/v4/letter/d/e68b1a/32.png) [@DMark](https://boards.straightdope.com/u/DMark)\ **Post date:** [October 14, 2005, 12:24am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/355 "2005-10-14T00:24:04Z")
> [@Landshark](#): > > July 15 Ditto here. July 15th ---
**Author:** ![deevee](https://avatars.discourse-cdn.com/v4/letter/d/57b2e6/32.png) [@deevee](https://boards.straightdope.com/u/deevee)\ **Post date:** [October 14, 2005, 12:47am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/356 "2005-10-14T00:47:16Z")
December 04 ---
**Author:** ![cat39645](https://avatars.discourse-cdn.com/v4/letter/c/c37758/32.png) [@cat39645](https://boards.straightdope.com/u/cat39645)\ **Post date:** [October 14, 2005, 1:23am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/357 "2005-10-14T01:23:30Z")
> [@Dominic Mulligan](#): > > Another November 20th, here. What year, Dominic? ---
**Author:** ![Enright3](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/enright3/32/2897_2.png) [@Enright3](https://boards.straightdope.com/u/Enright3)\ **Post date:** [October 14, 2005, 1:27am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/358 "2005-10-14T01:27:55Z")
> [@marque elf](#): > > Statistically it supposedly works out that in any group of 30 people, 2 will have the same birthdate. The first place I heard this was _Let’s Make A Deal_, perhaps not the most reliable of sources. Later I heard from a more reliable source. I never took statistics so I wouldn’t understand the math but intuitively this doesn’t seem right to me. Your odds for any specific birthday are only 1 in 365/366. Why does the probability drop down to 1 in 1 when 30 people are present? Each birthday is a random event. Shouldn’t then the probability be 1 in 365 times 2 times 30? That doesn’t equal 1 in my book. > > Can any explain to me why this is so? > > We have had 206 respondents for 160 days. That may not equal 1 in 365 but it is not far off from it either. You’re a little bit off on your statistic. There’s a 50% chance that among 23 people, two of them will have the same birthday. It’s calculated by figuring the odds of NOT having the same birthday as everyone else. i.e. 1 person in a room there is 365/365 percent (100%) chance that person 1 will not match anyone elses birthday. Person 2 walks in the room and has (365/365) \* (364/365) percent (99.7%) chance that they don’t match anyone else’s birthday Person 3 walks in the room and has a (365/365) \* (364/365) \* (363/365) percent (99.2%) that they don’t match anyones birthday. Keep going like this, and you’ll reach roughly 50% after the 23rd person. E3 ---
**Author:** ![Diogenes\_the\_Cynic](https://avatars.discourse-cdn.com/v4/letter/d/e99b99/32.png) [@Diogenes\_the\_Cynic](https://boards.straightdope.com/u/Diogenes_the_Cynic)\ **Post date:** [October 14, 2005, 1:38am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/359 "2005-10-14T01:38:52Z")
April 9th. ---
**Author:** ![Biffy\_the\_Elephant\_Shrew](https://avatars.discourse-cdn.com/v4/letter/b/e47c2d/32.png) [@Biffy\_the\_Elephant\_Shrew](https://boards.straightdope.com/u/Biffy_the_Elephant_Shrew)\ **Post date:** [October 14, 2005, 2:50am UTC](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244/360 "2005-10-14T02:50:17Z")
I can fill that **June 2** gap. [Previous page](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244.md?page=17) [Next page](https://boards.straightdope.com/t/lets-see-how-many-days-of-the-year-we-can-fill-with-doper-birthdays/325244.md?page=19)