Thailand
Lucky Thai lottery ticket number
Three 6-digit numbers built from your own chart — your favourable digits weighted in, the ones your chart works against removed. These are numbers to look for at the vendor, because the ticket already carries its number.
This is a ticket game, not a pick game
The Thai Government Lottery does not work like a pick game. Tickets are printed in advance with a six-digit number on them, and buying one means walking a vendor's board and choosing a ticket whose number you like. That is why Thai lottery sellers are browsed rather than queued at, and why a number here is something to look for rather than something to fill in.
The odds follow from that directly. There are one million 6-digit numbers, so a given ticket taking first prize is 1 in one million. Most prizes on these games come from matching only the last two or three digits, which is where nearly all realised winnings sit.