People often have their preferences in terms of songs they listen to. The answer is in the image attached.
Note that:
In the first letter in the outcome given is OO and thus
we use O as the first letter in Song 1 while N as the second letter in Song 1 (1:1 that is Old song-New song).
So for ease, you distribute the both outcome found in song one to song 2 because there is equal probability that both song (Found in equal proportion in song 1) will appear in the same proportion in Song 2 (2:2).
When you combine the songs of 1 with that of song 2, The outcome or probability of their occurrence will be OO, ON, NN, NO.
Learn more about probability from
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