DJ Erin is making a playlist for work; he is trying to decide what

songs to play and in what order they should be played.

Step 2 of 2 :  If he has his choices narrowed down to country, pop,  disco, and  hip-hop songs, and he wants to play all disco songs, how many different playlists are possible? Express your answer in scientific notation rounding to the hundredths place.

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