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 25, 2007
Two girls are born to the same mother, on the same day, at the same time, in the same year and yet they're not twins. How can this be?