Angel has 10 DVD movies on a shelf, 5 dramas, 4 science fiction movies, and 1 comedy. Two movies will be selected at random. Determine the probability of each situation below.
a) Selecting at least one drama movie, with replacement
b) Selecting at least one drama movie, without replacement
a) The probability of selecting at least one drama movie, with replacement, is \( \square \)
(Type an integer or a simplified fraction.)