http://en.wikipedia.org/wiki/Arthur_C._Clarke" [Broken] was a great author. What many don't know is that he was a very good inventor, as well as a statistics afficionado, his acclaim here, I suspect, as an auditor in the pensions section of the Board of Education (London Gazette: no. 34321, p. 5798, 8 September 1936. Retrieved on 2008-03-19.), although his interests along these lines may have been helped considerably with his Kings College degree in Mathematics he earned after the war.(adsbygoogle = window.adsbygoogle || []).push({});

Given: Everyone on a bus has an equal chance of having a birthday on any given day of the year.

Find: How many people must be aboard the bus for the odds of any single person having a birthday on today's date to be greater than 50%.

Ahh... Sounds easy! I know the answer, and in 1994, I actually worked out the proof, despite the fact that I was (and am still not) either a math or a statistics teacher.

So, my challenge to you is:

Post the Proofsupporting your answer.

Hint: The answer is 23 (until I'm proven wrong).

And as a very interesting side note, he worked on various predictions between 1958 to 1962, which became known in 1962 asProfiles of the Future.

Among his predictions through the year 2100 was a "global library" in 2005.

Hmm... Wikipedia, anyone?

Clarke was smart, and well ahead of his time. Let's see how smart you are, given the answer!

Again, it could be wrong...

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# Arthur C. Clarke's Birthday Bet

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