Probability of Envelopes  I need assistance with following
problem along with steps to arrive at the solution/answer.
Three envelopes are addressed for 3 secret letters written in
invisible ink. A secretary randomly places each of the letters
in an envelope and mails them. What is the probability that at
least 1 person receives the correct letter?  Solution Summary
This is a probability problem regarding randomly mailed letters.
The solution explains how to solve the problem and shows the
answer through step by step calculation.