I thought of this while driving this morning and it's bugging me that I can't think through the answer properly. It's a while since we've had one of these logical/mathematical problems on After Hours so I thought some of you guys might be interested. I have an MP3 player in my car that will either play the tracks sequentially or at random. If played sequentially, it obviously enough plays track 1, then track 2, etc, until you reach the last track. The random play plays tracks at random (duh ...) and can play the same track two or more times before all the tracks on the disc have been played. Okay, here's the problem. Let's suppose that I have a disc with e.g. 100 tracks on it and I want to hear a particular song which I know is on the disc but I don't know where it is. Let's also suppose that once I start playing the disc I've just got to let it run (i.e. I can't use the track skip button). Will sequential or random play be more likely to play the song I want to hear first? An additional question - does it matter how many tracks there are and whether some are much longer than others? Obviously enough, the random play is more likely to succeed if the track is one of the last on the disc, but beyond that the problem gets a little sticky.