Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
If a code word is defined to be a sequence of different [#permalink]
23 Jun 2006, 14:35
If a code word is defined to be a sequence of different letters chosen from the 10 letters A B C D E F G H I J what is the raatio of the number of 5 letter code words to the number of 4 letter code words.