Is there a problem with this question? First of all, guessing the coin itself is a random event. Whether A can win or not is a question, not to mention the requirements of winning most apples. I seriously doubt whether this question is a correct one! Because every time it is new, it has nothing to do with the last and previous results, nor can it be calculated by the probability of calling, so it is useless for A to decide how many apples to send each time. According to the standard gambler algorithm, losing twice and winning once is useless. The total number of players is only 100, which is too small to support this probability. Generally speaking, this is a false proposition. If you have the answer, you can find someone to make a fortune!