AP EAPCET 18 May 2024 Shift 1 Solved Paper

To determine the probability that at least one letter is placed in the wrong envelope, consider the following:
Correct Arrangement: There is only 1 way to place all letters in the correctly addressed envelopes, which means every letter is in its intended envelope.
Therefore, the probability that at least one letter is placed in the wrong envelope is:
1−‌

1

120

=‌

119

120