From marked 1, 2, 3 If you take any two of the nine pieces of paper, the probability that the product of the numbers of the two pieces of paper is even is () A. 12B. 718C. 1318D. 1118

From marked 1, 2, 3 If you take any two of the nine pieces of paper, the probability that the product of the numbers of the two pieces of paper is even is () A. 12B. 718C. 1318D. 1118

From the meaning of the question, we can know that this question is the probability of an equal possible event, ∵ the event included in the experiment is to take any two of the nine cards, with a total of C92 = 36 results, and the event meeting the condition is that the product of the two pieces of paper numbers is even, including two cases, one is that both numbers are even, with a total of C42 = 6 results, the other is that one of the two numbers is odd and one is even, with a total of c41c51 = 20 results Then, there are 6 + 20 = 26 events that satisfy the conditions. According to the probability of the equal possible events, we get P = 2636 = 1318, so we choose C