motodds
motodds
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November 19th, 2020 at 4:24:46 PM permalink
I discovered something interesting and I am curious regarding "What are The Odds?"

My Father's Birthday is Nov 12
My Birthday is Nov 13

I calculate the odds of this @ 354:1 (I ignored leap year)

My boss's birthday is Nov 12
My boss's son's birthday is Nov 13

See where I a going with this.

What are the odds of two father/son pairs sharing the same birthday combination?

I calculate the odds at 48,627,124:1

How close did I get? What is the math?
ThatDonGuy
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November 19th, 2020 at 6:27:16 PM permalink
Quote: motodds


What are the odds of two father/son pairs sharing the same birthday combination?

I calculate the odds at 48,627,124:1

How close did I get? What is the math?


First of all, I assume you meant 364:1.

If the father's birthday has to be the day before the son's in both cases, the probability is 1/365 (that the son's birthday is the day after the father's) x 1/365 (that the second father's birthday is the same as the first) x 1/365 (that the second son's birthday is the same as the first) = 1 / 48,627,125, or, as you put it, odds of 48,627,124 : 1 against.

If the son's birthday can be first, then it's 2/365 x 1/365 x 1/365 = 2 / 48,627,125, or odds of 24,313,561.5 : 1 against.
miplet
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November 19th, 2020 at 7:48:01 PM permalink
I was also born the day after my father.
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DRich
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November 19th, 2020 at 7:50:58 PM permalink
Quote: motodds


What are the odds of two father/son pairs sharing the same birthday combination?



With 10 billion people on the planet I would guess that it is almost guaranteed.
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Wizard
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November 19th, 2020 at 7:51:10 PM permalink
Both of my brothers were born on the same day, four years apart. My wife and son are five days apart.
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DJTeddyBear
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onenickelmiracle
November 20th, 2020 at 6:12:53 AM permalink
Really?

In typical gambler fashion, you’re trying to assign meaning to meaningless coincidences.

It’s just a coincidence. Shit happens.
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DRich
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November 20th, 2020 at 7:28:38 AM permalink
There are 365 days in the year but if you have 25 people in a room it is likely 2 or them will have the same birthday.
At my age, a "Life In Prison" sentence is not much of a deterrent.
FatGeezus
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November 20th, 2020 at 9:57:05 AM permalink
I heard that there were three brothers born on the same day. I think it was the McManus triplets.
rsactuary
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November 20th, 2020 at 12:56:27 PM permalink
Similarly, my oldest brother was born on Jan 22, my other brother born on April 22, and me (the youngest) born on July 22. Different years, obviously.
DRich
DRich
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November 20th, 2020 at 1:03:31 PM permalink
Quote: rsactuary

Similarly, my oldest brother was born on Jan 22, my other brother born on April 22, and me (the youngest) born on July 22. Different years, obviously.



Would be a lot more unlikely had you all been born the same year on those dates.
At my age, a "Life In Prison" sentence is not much of a deterrent.
DogHand
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November 20th, 2020 at 2:58:10 PM permalink
A friend of mine was a WWII veteran, so when he died he was buried in a national cemetery. Since the cemetery assigns the plots according to when the decedents arrive, I was not terribly surprised when I noticed the veteran buried adjacent to my friend shared the same date of death. However, I WAS surprised to see that they also shared the same date of birth: day and year.

Dog Hand
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