# Math Help - BIrthday probability

1. ## BIrthday probability

Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .

2. Originally Posted by mathaddict
Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
Can you find the probability that 2 people from 3 DO have the same birthday?

3. probability that all will have different Birthdays
=(365X364X363
) /( 365X365X365)

=(364X363) / (365X365)

4. Originally Posted by mathaddict
Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
Same technique as post #6 in this thread: http://www.mathhelpforum.com/math-he...-problems.html