跪求高人，看看这题怎么做
Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?
(A) 1/24 (B) 1/8 (C) 1/4 (D) 1/3 (E) 3/8
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2013-8-19 18:33:10
收藏
收藏
