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1 问题的产生请思考以下问题 :某人有五把钥匙 ,其中有一把是办公桌的抽屉锁钥匙 ,但他忘了是哪一把 ,于是他便将五把钥匙逐把不重复试开 .问恰好第三次打开抽屉锁的概率是多少 ?很快便有同学A给出了一个解法 :P(A) =mn =A4 4A55=15 .①教师 :“对同学A的解法能理解吗 ?”学生
1. The question arises. Consider the following questions: Someone has five keys, one of which is the key to the drawer of the desk, but he forgot which one he had, so he took five keys and tried repeatedly. What is the probability of asking the third time to open the drawer lock? A classmate A quickly gives a solution: P(A) = mn = A4 4A55 = 15.1 Teachers: “Can the solution to classmate A be understood? ”student