Endpiece: The Puzzler #9

Published Friday, August 01, 2008

BRAINTEASER: THREE-COIN TOSS YOU HAVE THREE COINS IN YOUR POCKET. THEY ARE IDENTICAL IN EVERY WAY EXCEPT TWO ARE FAIR COINS (HEADS ON ONE SIDE, TAILS ON THE OTHER) AND ONE IS AN UNFAIR COIN (BOTH SIDES ARE HEADS). YOU DIG INTO YOUR POCKET AND PULL OUT ONE COIN AT RANDOM. WITHOUT INSPECTING IT, YOU FLIP THE COIN THREE TIMES. YOU GET HEADS ALL THREE TIMES. WHAT IS THE PROBABILITY THAT THE NEXT TOSS OF THIS COIN WILL ALSO BE HEADS? Please email your solution to this month's contest to John Kador at jkador@jkador.com by September ...

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In This Issue: September 2010

Cover Story

Outgrowing The Series 7

When the 7 becomes more of a burden than a benefit.



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