The 100 Bills In 100 Boxes Puzzle

The 100 Bills In 100 Boxes Puzzle

If everyone goes into the room one at a time and searches 50 boxes randomly, then the chances of everyone locating their bill are incredibly small. But if everyone follows a simple strategy, then the odds of each person finding their bill go up to 31%!

03:59

Key Facts In This Video

  • 1

    If everyone went into the room and chose 50 boxes to look inside at random, the chances of everyone finding their bill is .5 to the power of 100. (0:22)

  • 2

    One strategy results in everyone finding their bill 31.18% of the time. (1:15)

  • 3

    The best strategy for solving the bills-in-boxes problem doesn't increase the odds that any individual will find their bill—it increases the odds that everyone will find their bill. (3:17)

See all

Puzzles

Drinks

India

Research

Get smarter every day! Like us on Facebook.
You'll get the most interesting and engaging topics in your feed, straight from our team of experts.