Gort/Michal, thanks for that very informative. I asked the question to try and anylise an old sytem from the UK. That is to take all duel winners and back em with a 1 unit TREBLE next 3 races , obviously trying to collect on the ones that win 5 in a row. Some of the SP's are amazing considering but I doubt that it can show a profit based on what you have come up with.

Taking Michal figures, I take it that there would be only 18 trebles successful from 3000+ bets?

Taking Gorts figures it looks like 6283 bets for 93 successful trebles ? now that's better but still not better enough i.e. we'd need to draw an ave. of $68 from each winning treble just to break even, ($1 stake) which would need an ave SP of a little over 3-1 (i.e. $4x$4x$4) mmmmmm possible I suppose, but.....

I gues it's another MYTH EXPLODED

But thanks anyway much appreciated!