Show the odds of any two individuals on the soccer fiel

Show the odds of any two individuals on the soccer field during a game having the same birthday are slightly greater than 1:1 (1:0.9732 actually). Each soccer team has 11 members on the field plus one referee (23 total individuals). Assume 365 days in the year (ignore leap year).http://www.questfactory.com/finance-homework-answers.html
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