Hello, thefirsthokage!

Here's one approach . . .

You read 8 plays over 2 days, 4 plays per day.

If Hamlet and Macbeth are two of the plays,

what is the probability that you read them on the same day?

There are: ways to read the books.

There are two cases to consider:

If you read Hamlet and Macbeth on the first day,

. . there are choices for the other 2 books read the first day.

. . The other 4 books are read the second day.

If you read Hamlet and Macbeth on the second day,

. . there are choices for the other 2 books read the second day.

. . The other 4 books are read the first day.

Hence, there are ways that Hamlet and Macbeth can be read on the same day.

Therefore: