motodds
• Posts: 1
Joined: Nov 19, 2020
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
• Posts: 6449
Joined: Jun 22, 2011
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
• Posts: 2117
Joined: Dec 1, 2009
November 19th, 2020 at 7:48:01 PM permalink
I was also born the day after my father.
Man Babes #AxelFabulous
DRich
• Posts: 11998
Joined: Jul 6, 2012
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.
At my age, a "Life In Prison" sentence is not much of a deterrent.
Wizard
• Posts: 26671
Joined: Oct 14, 2009
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.
"For with much wisdom comes much sorrow." -- Ecclesiastes 1:18 (NIV)
DJTeddyBear
• Posts: 11009
Joined: Nov 2, 2009
Thanked by
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.
I invented a few casino games. Info: http://www.DaveMillerGaming.com/  Superstitions are silly, childish, irrational rituals, born out of fear of the unknown. But how much does it cost to knock on wood? 😁
DRich
• Posts: 11998
Joined: Jul 6, 2012
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
• Posts: 567
Joined: Jun 12, 2010
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
• Posts: 2315
Joined: Sep 6, 2014
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
• Posts: 11998
Joined: Jul 6, 2012
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