The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

   

Happy Birthday To Me!

Here's a simple, two-part puzzle suggested by the Minotaur's pal Arkamedes:

How many humans would you need to ask at random before there is a-better-than- average chance that at least two of them have the same birthday?

How many Martians would you need to ask at random before there is a-better-than-average chance that at least two of them have the same birthday?

For the purposes of this puzzle pretend that all birthdays are equally likely, and that Martians exist.


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