| woscar |
| quote: | Originally posted by winston
you're right i didn't specify the measuring units, therefore, that equation is rubbish.
we have to take in consideration we are dealing with 12 months and 365 days
* For one person, there are 365 distinct birthdays.
* For two people, there are 364 different ways that the second could have a birthday without matching the first.
* If there is no match after two people, the third person has 363 different birthdays that do not match the other two. So, the probability of a match is 1 - (365)(364)(363)/(365)(365)(365).
* This leads to the following formula for calculating the probability of a match with N birthdays is 1 - (365)(364)(363)...(365 - N + 1)/(365)^N. |
:stongue:
What the are you talking about? |
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