K 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. a) In how many ways can the DJ play the 9 songs if the songs can be played in any order? b) In how many ways can the DJ play the 9 songs if the first song must be a slow song and the last song must be a slow song? c) In how many ways can the DJ play the 9 songs if the first two songs must be fast songs? a) If the songs can be played in any order, the DJ can play the 9 songs in different ways. (Type a whole number.)