The number of sequences in which 4 players can sing a song, so that the youngest player may not be the last is ?5
1220 5b5cc6e1e4d2b4197774ebac
Q: The number of sequences in which 4 players can sing a song, so that the youngest player may not be the last is ?
- 12580false
- 23687false
- 34320true
- 45460false
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