About scratch cards.

The winning probability of any card in 500 cards is equal, but scratch cards are a special case. After sending it, I will know if the result is a lottery. If there is no winning medal in the cards issued, the winning probability of the remaining cards will increase, otherwise it will decrease. If the gift limit is given, the remaining cards will not win, but you can't let people know that the gift limit has been given. If you don't send the gift quota, the rest will win. Everything is under your control.