Question

Q5) Rui Feng writes 3 letters to 3 of his friends, Farhan , Vishal and Michael. He types each of
their addresses on each of the 3 envelopes and puts the letter into envelopes randomly before
he sends them out. Find the probability that,
(i) exactly one of his friend receive the correct letter.
(ii) exactly two of his friend receive the correct letters.
(iii) all three of his friends receive the correct letters.​

Answer 1

all three of his friends receive the correct letters.