I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Thursday, January 05, 2006
Millions of people buy a particular medicine. The disease for which the medicine is effective is one that these people have virtually no chance of catching. What do they buy?