Tanya prepared 4 different letters to be sent to 4 different address .For each letter ,she prepared an envelope with its correct address.if the 4 letters are to be put into 4 envelope at random.what is the possibility 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
answer:d
求牛牛及斑竹告诉思路,谢谢 | 
