Answer with explanation:
There are three different music CD's on shelf, which are:
jazz CD (J), a pop CD (P), and a rock CD (R).
When you will arrange three CD's in a row, order of putting CD's is Important. So, we will Apply the rule of Permutation.
Arrangement of three Distinct things can be done in either 3! or
ways.
= 3 × 2 ×1
= 6 ways
or

= {J PR, J RP, P R J, P J R, R P J, R J P}