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OK I've been searching the Web for an answer to a burning question. And finally this page has.. Or almost had an answer!

In a group of 19 people.

What are the odds that....

2 specific pairs of people share the same birthday.

A and B on 1st of Jan C and D on 1st of Feb

AND no one else has a same birthday with anyone else in the group of 19 people...

Lastly. Not sure if this is relevant...

What are the odds that..

Mom has same birthday as daughter in law 1 And dad has same birthday as daughter in law 2.

Or does this not matter in math... As in who's who?

Been trying all sorts of methods but I can't seem to figure out what the odds are.

Like would it be one in a million orrr?

Thanks in advance math whizzes!

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  • $\begingroup$ Perhaps you can demonstrate some of those Been trying all sorts of methods so that people can help more effectively. When adding information, please click on the tiny "edit" instead of commenting. $\endgroup$ – Lee David Chung Lin Apr 23 at 16:51
  • $\begingroup$ More like one in 194,491 $\endgroup$ – saulspatz Apr 23 at 16:52
  • $\begingroup$ Thanks! Problem is I'm not even sure how to approach it, I read up about the birthday paradox where odds of same birthday is 0.27%.. Then I stumbled upon this question on this site which was trying to solve exactly this! Let me find the link and share it here.. $\endgroup$ – Ray Tan Apr 23 at 16:53
  • $\begingroup$ math.stackexchange.com/questions/1539271/… $\endgroup$ – Ray Tan Apr 23 at 16:54
  • $\begingroup$ Now in that page there was an answer...... Like this... $\endgroup$ – Ray Tan Apr 23 at 16:54

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