Question

george prepared 4 different letters to be sent to 4 different addresses. for each letter, he prepared an envelope with its correct address. if the letters are placed in the envelopes at random, and the probability that (i) none of the letters is in the correct envelope and (ii) at least 1 letter is in the correct envelope.

Answer 1

first according to Shia and second probability the answer of first is 1
second 1 by 4