Re: Harder puzzles easier; 4 points in plane

CBFalconer <cbfalconer@xxxxxxxxx> writes:
Phil Carmody wrote:
Richard Heathfield <rjh@xxxxxxxxxxxxxxx> writes:
CBFalconer said:
Phil Carmody wrote:

... snip ...

To make it harder still - add still more people:
What's the probability of 400 people (selected uniformly)
not sharing any birthday?

Zero.

Yes, unless you want to cheat by, say, re-interpreting the
question to include people's year of birth in the definition
of "birthday", in which case the problem really does become
significantly more difficult.

Well, everyone's assumed this takes place on planet earth too,
it would be a different answer on venus or mars!

And those pesky leap years could mess things up too.

Nope, leap years don't affect that answer in the least.

Care to answer assuming one year in every 4 is a leap year, then?
(On earth, and year of birth not relevant.)

Phil
--
I tried the Vista speech recognition by running the tutorial. I was
amazed, it was awesome, recognised every word I said. Then I said the
wrong word ... and it typed the right one. It was actually just
detecting a sound and printing the expected word! -- pbhj on /.
.

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