Question

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

Answer 1

p(e)=no.of events/total no. of outcomes.
=4/8=1/2

not sure but hope this is correctone