Solve This Pzzlr: Graduation

Neatorama presents our collaboration with Pzzlr, a site where you can always find a riddle to exercise your brain. Can you solve this one?

Having just received their degrees, ten friends line up in the sunshine to have their photo taken when a gust of wind blows off their morterboards (caps). Each retrieves a cap at random during the ensuing scramble. What is the probability that exactly nine of them retrieve their own cap?

Do you know the answer? The solution is at Pzzlr!

Look for a new puzzle here at Neatorama every Wednesday, and check out Pzzlr for a puzzle anytime!

(Image credit: Flickr user Thompson Rivers University)

Love games and puzzles? Visit NeatoPuzzles for more!

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