OFFSET
0,1
COMMENTS
This is the probability that at least two people in a room of 23 randomly selected people share a birthday, ignoring leap days and assuming days are equiprobable.
This is a rational number; numerator and denominator both have 53 digits. - Charles R Greathouse IV, Jul 11 2020
LINKS
Eric Weisstein's World of Mathematics, Birthday Problem
EXAMPLE
0.5072972343239854072254172283370325...
MATHEMATICA
RealDigits[1- ((365!) / ((365 - 23)! * 365^23)), 10, 120]
PROG
(PARI) 1. - 364!/(342! * 365^22) \\ Charles R Greathouse IV, Mar 25 2020
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
Kritsada Moomuang, Mar 25 2020
STATUS
approved