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#12
07-15-2005, 06:48 PM
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Re: same birthday
LOL...excellent lateral thinking.
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#14
07-17-2005, 01:24 PM
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Re: same birthday
[ QUOTE ]
Edit: Keep in mind, I'm assuming that you're really just looking for an answer here. All of the nuances discussed by others in this thread are valid. My numbers represent you picking three random people off the street. [/ QUOTE ] Is there any way to account for the fact that most babies are born right around 9 months. If the OP is born on Jan. 1 and his mother gets pregnant with a baby a few years later in November, there is 0% chance of the baby being born on Jan. 1 and surviving. Picking 3 random people off the street will give you use of the entire 365 days in the year. But parents can "control" when they want their babies to be born, to some small extent. At least within a range of a few months. I guess I don't understand if the OP is talking about 3 random people off the street, or the odds of having 3 planned births on the same date. For the later, I guess pregnancy dates might be required.
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#15
07-17-2005, 01:28 PM
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Re: same birthday
[ QUOTE ]
my brother, my grandfather and i all have the same birthday. [/ QUOTE ] I was born (statement of the century). My sister was born 7 years later, the day before I was born. For example, my birthday might be May 5, my sister would be born May 4, 7 years later. My dad was born on Halloween. My mom was born on Thanksgiving (some years her bday is on Thanksgiving, it changes from year to year). My cousin was born on Valentine's day.
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#16
07-17-2005, 01:44 PM
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Re: same birthday
[ QUOTE ]
[ QUOTE ] my brother, my grandfather and i all have the same birthday. [/ QUOTE ] I was born (statement of the century). My sister was born 7 years later, the day before I was born. For example, my birthday might be May 5, my sister would be born May 4, 7 years later. My dad was born on Halloween. My mom was born on Thanksgiving (some years her bday is on Thanksgiving, it changes from year to year). My cousin was born on Valentine's day. [/ QUOTE ] yeah, yeah, i get it. i don't care. [img]/images/graemlins/smile.gif[/img]
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#17
07-17-2005, 02:09 PM
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Re: same birthday
[ QUOTE ]
my brother, my grandfather and i all have the same birthday. please settle an age old family debate. the odds of my brother and i having the same birthday is 365:1. the odds of my brother and i being born on one particular date is 365x365? the odds of the 3 of us having the same birthday is? the odds of the 3 of us being born on one particular date is? [/ QUOTE ] One thing to consider.... You would be equally surprised, eg, if you, your brother, and your grandMOTHER were all born on the same day too. Or, say, you, your father, and your grandfather.... So to get a more reasonable answer, you should consider the group of people for which this phenomenon would also be valid. I don't know how many siblings you have, but let's say the group, at the very least, consists of: You brother mother father 2 grandfathers 2 grandmothers 8 people total. Now the question is: What is the chance that 3 people, out of a total of 8 people, all share a birthday? The first term of inclusion-exclusion will provide a reasonable estimate: (8 choose 3)*(1/365)^2, about 1 in 2379 If you have more siblings it obviously becomes more likely.
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#18
07-17-2005, 02:11 PM
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Re: same birthday
[ QUOTE ]
[ QUOTE ] [ QUOTE ] my brother, my grandfather and i all have the same birthday. [/ QUOTE ] I was born (statement of the century). My sister was born 7 years later, the day before I was born. For example, my birthday might be May 5, my sister would be born May 4, 7 years later. My dad was born on Halloween. My mom was born on Thanksgiving (some years her bday is on Thanksgiving, it changes from year to year). My cousin was born on Valentine's day. [/ QUOTE ] yeah, yeah, i get it. i don't care. [img]/images/graemlins/smile.gif[/img] [/ QUOTE ] LOL. Birthday Brag Tread!
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#20
07-17-2005, 03:42 PM
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Re: same birthday
[ QUOTE ]
The odds aren't as high as you think. A birth is not a random event. Two people had to do something nine months earlier. [/ QUOTE ] I assumed that it was to answer the question, and I'm sure the OP assumed that everyone would make that assumption. It's kind of a convention when people ask these types of questions.
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