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huffdaddy
Joined: 25 Nov 2005
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 Posted: Sat Dec 16, 2006 10:47 pm Post subject: Probability question |
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http://www.suntimes.com/news/metro/174929,CST-NWS-baby16.article
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One birthday covers entire family
It's Dec. 14 for mom, dad, new son
...
In case you were wondering, the probability of three people being born on the same date is 1 in 48 million. |
So why is the probability 1/(365*365*365)? Shouldn't it be 1/(365*365)?
Person A has a birthday (1 in 1). The odds of another person having the same birthday is 1/365. The odds of another person having the same birthday is 1/365. Which is 1/(1*365*365). Which is 1 in 23,725. Or am I missing something? |
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mnhnhyouh
Joined: 21 Nov 2006
Location: The Middle Kingdom
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| Posted: Sat Dec 16, 2006 10:52 pm Post subject: |
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You are right. 1/(365*365*365) is the probability for all being born on a particular day, not all on the same day, no matter what that day is.
h |
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