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disc jockey has 11 songs to play. Seven are slow songs, and four are fast songs. Each song is to be played only once. In how many ways can the disc jockey play the 11 songs if
a) The songs can be played in any order.
b) The first song must be a slow song and the last song must be a slow song.
c) The first two songs must be fast songs.
 
Guest Apr 9, 2012
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