What  is  the  probability  that  two  randomly  selected  people  have  birthdays  on  the same  day  (same  day  and  month)? What  is  the  probability  that  among  n  randomly  selected  people  there  are  at  least two  with  birthdays  on  the  same  day  (same  day  and  month)? How  large  n  should  be  for  this  probability  to  exceed  50%?

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