The number of ways to make the playlist with all different songs such that the 4 songs are in order is; 16!/13!3!.
What numbe of ways can the the playlist be made if the songs must be in order?
It follows from the task content, that a playlist of 16 songs is to be made.
Additionally, the songs Leavon, Dream on, Here Comes the Sun, and Clocks must be played in order.
In essence, only 13 varieties are now available from the sixteen.
Therefore, the number of different ways to make the playlist is; 16!/13!3!.
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