A disc jockey (DJ) has 9 songs to play. Five are slow songs, and 4 are fast
Question:
A disc jockey (DJ) has 9 songs to play. Five are slow songs, and 4 are fast songs. Each song is to be played only once. In how many ways can the DJ play the 9 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?
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Related Book For 
A Survey of Mathematics with Applications
ISBN: 978-0134112107
10th edition
Authors: Allen R. Angel, Christine D. Abbott, Dennis Runde
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