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 in 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address? Pick:
A) 1/24
B) 1/8
C) 1/4
D) 1/3
E) 3/8
Possible sequences are CIII, ICII, and so on...C=correct, I=incorrect   Total possible sequences are 4P1=4 ways.   Lets take the probability of having one particular sequence CIII.   P = 1/4*2/3*1/2*1 = 1/12.   So the probability of having any of the sequence is 4*1/12 =1/3   ANS:1/3
<result>D</result>
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 in 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?