2
$\begingroup$

What is the probability that in a randomly chosen group of r people at least three people have the same birthday?

I have tried doing this question as fallows- 1-(probability of all people having different birthday+ any 2 people have same birthday+2 people in each of 2 sets have same birthdays but distinct for particular set+probability of 2 people in each of 3 sets have same birthdays but distinct for particular set+.......)

but i can't generalize it....

$\endgroup$
5
  • $\begingroup$ I have tried doing this question as fallows- $\endgroup$
    – Mayank Deora
    Commented Nov 9, 2014 at 12:10
  • $\begingroup$ 1-(probability of all people having different birthday+ any 2 people have same birthday+2 sets of 2 people each have distinct same birthdays+.......) $\endgroup$
    – Mayank Deora
    Commented Nov 9, 2014 at 12:12
  • $\begingroup$ but i am unable to generalize its result. $\endgroup$
    – Mayank Deora
    Commented Nov 9, 2014 at 12:13
  • 1
    $\begingroup$ You should add what you tried to the question. Don't put it in comments. $\endgroup$
    – drhab
    Commented Nov 9, 2014 at 12:14
  • $\begingroup$ @MayankChaturvedi please take a look at my solution. Hope this helps you understand the question. $\endgroup$
    – Varun Iyer
    Commented Nov 9, 2014 at 12:31

0

Reset to default

Browse other questions tagged .