1, two people grab the answer, and it is generally believed that the probability of two people grabbing the question is 1/2. Therefore, the probability that A catches the question and answers it correctly is1/2 *1/5 =110; B The probability of answering the question correctly is1/2 *1/4 =1/8. So the answer is1/8+110 = 9/40 (this question is not clear, it does not explain the probability of two people competing for the question, nor does it explain the answer method. If the first answer is wrong, will the other one have a chance to answer it again? Therefore, it can only be discussed according to the general situation, and it is considered that the probability of two people grabbing is equal, and the question can only be answered. The probability that A won the championship and B didn't win the championship is 3/5*3/5=9/25, that A didn't win the championship is 2/5*2/5=4/25, and that both teams won the championship is 3/5*2/5=6/25. Therefore, the answer is 9/25+4/25+6/25= 19/253. There are only two situations: A does not enter B or A does not enter B, the probability of A not entering B is 0.6*0.4=0.24, and the probability of A not entering B is 0.4*0.6=0.24, so the answer is given.