Tanya prepared four different letters to be sent to four dif

[rschunti]

Tanya prepared four different letters to be sent to four different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the envelopes at random, what is the probability that only one letter will be put into the envelope with its correct address?

This is GMAT PREP question. What is the best approach to solve this.

[StaceyKoprince]

First, please don't forget to post question in full, including answer choices.

Second, this one has been discussed before: http://www.manhattangmat.com/forums/post5773.html
Please also search for problems before you post; a lot have already been discussed! If you still have a question about the problem, add it to the already-existing thread for this problem. Thanks!

[dUTCH GUEST]

Very nice method of solviing for quite a tricky problem