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!
Monday, December 12, 2011
Been A While Since I Did Some Statistics
How many 2 digit numbers can you make using the digits 1, 2, 3 and 4 without repeating the digits?