Math
posted by Meredith .
A band has 25 new songs, how many different ways are there for the group to record a CD consisting of 12 songs chosen from 25 new songs. ( The order in which the songs appear on the CD is relevant).

25*24*23*....14 or
25!/(2512)! 
11

DJ Jacqueline is making a playlist for an mp3 player; she is trying to decide what
12
12
songs to play and in what order they should be played. If she has her choices narrowed down to
21
21
blues,
13
13
reggae, and
25
25
hiphop songs, and she wants to play an equal number of blues, reggae, and hiphop songs, how many different playlists are possible? Express your answer in scientific notation rounding to the hundredths place.