There are 3 letters and 3 addressed envelopes. Find the probability that all the letters are not put in right envelope.
Dear student , Probability that all the letters will be put in right envelope = 1 รท all the possibilities = 1/3! = 1/6 . ( Where no. Of possibilities that all are in right envelope = 1) So probability that all the letters will not be put in right envelopes is = 1 - 1/6 = 5/6 . Regards