Every raffle ticket number that is generated and printed on your physical or virtual ticket , is entered into the draw (database). The computer then selects 50 or 100 database entry (raffle tickets from virtual hat).
So the odds of winning are for one raffle ticket depends on how many lotto tickets bought by the public (lines).
So if If the prize fund is say £4,000,000 that day and this is approx half of fund (£8,000,000) ...then odds are 4,000,000 to 1 ish
But you get 50 tries ..so F knows what that makes the odds lol